United States

Abstract Title
Effect of Climate and Energetics within Southeast Asian Nasal Morphology 

Authors: Isaac Nebeker1, Fabio Savoldi2, James Kit-Hon Tsoi3, Michael Rivera4, Andy Wai Kan Yeung5, Alexa P. Kelly1

1Campbell University School of Osteopathic Medicine; 2University of Brescia, Orthodontics, Dental School, Department of Medical and Surgical Specialties, Radiological Sciences and Public Health 3The University of Hong Kong, Dental Materials Science, Applied Oral Sciences and Community Dental Care, Faculty of Dentistry 4The University of Hong Kong, Faculty of Social Sciences 5The University of Hong Kong, Oral and Maxillofacial Radiology, Applied Oral Sciences and Community Dental Care, Faculty of Dentistry, 


Background
Under normal breathing (eupnea), virtually all inspired air must pass through the internal nasal cavity. Recent research has revealed that inspiration functionality may vary according to environmental climate and body size constraints. In turn, these constraints have altered the shape and size of not only the nose, but total craniofacial anatomy, over the course of human history. Populations indigenous to colder-drier environments consistently exhibit taller, narrower, and longer internal noses. This morphological adaptation increases the heating and humidification of inspired air, as well as satisfies metabolic oxygen demand. Thus far, studies evaluating the effects of energetics and environmental climate on nasal morphology have not incorporated large samples of humans from hot-humid climates. Accordingly, this study aimed to quantify nasal variation in the context of climate and body size in a large sample of humans from Southeast Asia.

Methods
We employed three-dimensional geometric morphometrics, a quantitative methodology widely used in biological anthropology, facilitated by recent advancements in 3D imaging technology that allow for high-resolution analysis of craniofacial structures. In this study, computed tomography (CT) scans were obtained from 63 individuals (11 females, 52 males) curated in the Human Bone Collection at The University of Hong Kong. Using 3D Slicer imaging software, forty-nine three-dimensional coordinate landmarks were systematically recorded on the cranial CT scans and then utilized in Procrustes-based shape analysis. Additionally, body mass and climate-specific basal metabolic rate (BMR) were estimated through established predictive equations applied to postcranial skeletal elements associated with each cranium.

Results
In this sample, significant sexual dimorphism was observed in both BMR (p &lt; 0.0003) and nasal centroid size (p &lt; 0.0001), with males exhibiting larger internal nasal structures and higher metabolic rates. While nasal height (p = 0.398) and breadth (p = 0.114) were not significantly associated with BMR, nasal length was (p &lt; 0.025), suggesting a relationship between internal nasal elongation and energetic demand. Additionally, a progressive increase in nasal height and length was observed in individuals with high BMRs.

Conclusion
These findings suggest that in hot, humid environments where ambient air is closer to core body temperature and humidity, evolutionary pressures on nasal height and breadth for air conditioning are reduced. Instead, nasal morphology appears to reflect a balance between respiratory efficiency and thermoregulation, particularly through increases in nasal length to accommodate metabolic demand. This has important implications in otolaryngology; especially in our increasingly globalized world wherein individuals are frequently inhabiting diverse environments with greater frequency.


AMA Research Challenge 2025 

Effect of Climate and Energetics within Southeast Asian Nasal Morphology

[![](https://assets.underline.io/uploads/markdown_image/1/image/261902fdf187a88bfa74da226ff77186.png)](https://drive.google.com/file/d/1gUViQJJHCSgM38OhwpDoTdN89evCsZ-7/view?usp=sharing)
[![](https://assets.underline.io/uploads/markdown_image/1/image/1605292c232e6f185c7f87ee38e8502a.png)](https://drive.google.com/file/d/1kPkznVX_6cx-n846z_pUtyVDZql9KImc/view?usp=sharing)


### **Welcome Message**

Welcome to the inaugural **Dutch Lung Congress.**  We have all missed our opportunities to network and interact with our colleagues in the last twelve months or more.  While our desire was to meet face to face once again, when it became evident that this would not be possible until much later in 2021 (or even into 2022) the hard working committee organizing the Dutch Lung Congress found, what we hope will be, an excellent alternative to facilitate our annual meeting.

The Dutch Lung Congress aims to bring together everyone interested in research related to pulmonary diseases in the Netherlands.  We hope this event will provide opportunities for multidisciplinary interactions to enhance our approaches for addressing these challenging diseases.  Each session will include input from patients, clinical and basic and/or translational scientists discussing the latest information around the central themes chosen by the organizing committee.  One advantage of holding our congress as a virtual event this year is that we will have the opportunity to hear from world leading experts from all over the globe.  We hope you enjoy the programme the organizing committee have put together and will engage in dynamic discussions with all the speakers.

One highlight of our congress will be the Young Investigator Session.  Remember to join us for this exciting session when we will hear from the presenters who submitted the top scoring abstracts.  This promises to be a session full of exciting science that will display the strengths that constitute the future talent in our field.

When we are not listening to these great presentations we can all meet in Gathertown.  Within this interactive platform you will be able to meet colleagues and friends for networking. Enjoy a private chat over a virtual coffee, visit the booths of our sponsors and other parties, chat with the Young Investigator Board members or take some timeout in the relaxation spaces.  While in Gathertown take the opportunity to visit all the diverse posters on display. Chat live with the presenters or leave them a question on the discussion board for them to engage with you.  Make sure you check for any messages each time you enter Gathertown to make the most of your networking opportunities.

We look forward to seeing you during the DLC and the great scientific (and other) discussions we are anticipating during our 2021 meeting.

On behalf of the DLC organizing Committee
<br>**Janette Burgess
<br>Chair, DLC Organizing Committee**
![](https://assets.underline.io/uploads/markdown_image/1/image/f461fb275d9667fb2a76a30813388e90.png)



### Special Session: Publieksmiddag
![](https://assets.underline.io/uploads/markdown_image/1/image/77e768dd500e6205175e5cafba59abdc.png)






![](https://assets.underline.io/uploads/markdown_image/1/image/f461fb275d9667fb2a76a30813388e90.png)
**More about the committee team:**:
[Barbro N. Melgert, PhD] (https://drive.google.com/file/d/1q_IIH3JvTivumCUzzsZGX7BgD41HxQmk/view?usp=sharing)
// [Bas Holverda, PhD] (https://drive.google.com/file/d/1QKXHmTTQjgs4OZVuM8doXU055S-fu_uU/view?usp=sharing)
// [Frits Franssen, PhD] (https://drive.google.com/file/d/1d7HRUJaqGuRFzkPN3SVgkbBfqFkDkWq2/view?usp=sharing)
// [Janette Burgess, PhD] (https://drive.google.com/file/d/1VHFlrEN6uCQGeeW3Lj4I8aTw7HsB0GFr/view?usp=sharing)
// [Michel van den Heuvel, PhD] (https://drive.google.com/file/d/1JeOEP8MHxiK_4lONr8UM2HaxdxpkAmA2/view?usp=sharing)
// [Patrick Bhairosing] (https://drive.google.com/file/d/1xI8ORq-g1bbVcrlRDviZ9NhAwanc4dFl/view?usp=sharing)
// [Gimano Amatngalim, PhD] (https://drive.google.com/file/d/1fyVDDKARLNjRk_JZk8_GyhGMjmp6DWHp/view?usp=sharing)
// [Peter Kunst, PhD] (https://drive.google.com/file/d/1QhtB4nQezpAjbfUAcBnINc-Bm3Shy2Lf/view?usp=sharing)
// [Dr. Michel van den Heuvel, Prof., MD, PhD] (https://drive.google.com/file/d/1JBdNEBXZCEikEZhJ6MoD5DhQfXMz3bP6/view?usp=sharing)
![](https://assets.underline.io/uploads/markdown_image/1/image/f461fb275d9667fb2a76a30813388e90.png)

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Dutch Lung Congress

Abstract Title
Effect of Climate and Energetics within Southeast Asian Nasal Morphology 

Authors: Isaac Nebeker1, Fabio Savoldi2, James Kit-Hon Tsoi3, Michael Rivera4, Andy Wai Kan Yeung5, Alexa P. Kelly1

1Campbell University School of Osteopathic Medicine; 2University of Brescia, Orthodontics, Dental School, Department of Medical and Surgical Specialties, Radiological Sciences and Public Health 3The University of Hong Kong, Dental Materials Science, Applied Oral Sciences and Community Dental Care, Faculty of Dentistry 4The University of Hong Kong, Faculty of Social Sciences 5The University of Hong Kong, Oral and Maxillofacial Radiology, Applied Oral Sciences and Community Dental Care, Faculty of Dentistry, 


Background
Under normal breathing (eupnea), virtually all inspired air must pass through the internal nasal cavity. Recent research has revealed that inspiration functionality may vary according to environmental climate and body size constraints. In turn, these constraints have altered the shape and size of not only the nose, but total craniofacial anatomy, over the course of human history. Populations indigenous to colder-drier environments consistently exhibit taller, narrower, and longer internal noses. This morphological adaptation increases the heating and humidification of inspired air, as well as satisfies metabolic oxygen demand. Thus far, studies evaluating the effects of energetics and environmental climate on nasal morphology have not incorporated large samples of humans from hot-humid climates. Accordingly, this study aimed to quantify nasal variation in the context of climate and body size in a large sample of humans from Southeast Asia.

Methods
We employed three-dimensional geometric morphometrics, a quantitative methodology widely used in biological anthropology, facilitated by recent advancements in 3D imaging technology that allow for high-resolution analysis of craniofacial structures. In this study, computed tomography (CT) scans were obtained from 63 individuals (11 females, 52 males) curated in the Human Bone Collection at The University of Hong Kong. Using 3D Slicer imaging software, forty-nine three-dimensional coordinate landmarks were systematically recorded on the cranial CT scans and then utilized in Procrustes-based shape analysis. Additionally, body mass and climate-specific basal metabolic rate (BMR) were estimated through established predictive equations applied to postcranial skeletal elements associated with each cranium.

Results
In this sample, significant sexual dimorphism was observed in both BMR (p < 0.0003) and nasal centroid size (p < 0.0001), with males exhibiting larger internal nasal structures and higher metabolic rates. While nasal height (p = 0.398) and breadth (p = 0.114) were not significantly associated with BMR, nasal length was (p < 0.025), suggesting a relationship between internal nasal elongation and energetic demand. Additionally, a progressive increase in nasal height and length was observed in individuals with high BMRs.

Conclusion
These findings suggest that in hot, humid environments where ambient air is closer to core body temperature and humidity, evolutionary pressures on nasal height and breadth for air conditioning are reduced. Instead, nasal morphology appears to reflect a balance between respiratory efficiency and thermoregulation, particularly through increases in nasal length to accommodate metabolic demand. This has important implications in otolaryngology; especially in our increasingly globalized world wherein individuals are frequently inhabiting diverse environments with greater frequency.


poster

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**Addison Shenk, a fourth-year medical student from Edward Via Virginia College of Osteopathic Medicine, was the winner of the 2025 AMA Research Challenge and was awarded the grand prize of $10,000, presented by Laurel Road.**

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Abstract Title: 3D Modeling and Virtual Implantation of Pediatric Leadless Pacemakers: Predictors of Acute Implant Angles

Background
Leadless pacemakers (LP) have advantages for treatment of arrhythmic disease in pediatric patients including high efficacy and lower rates of complications when compared to technologies involving leads. Anatomical differences among pediatric patients, including vertical cardiac orientation (acute IVC-to-target implant location angle) can make delivery catheter positioning and device implantation difficult. Early clinical experience at our institution suggests that access from the right internal jugular vein can aid in crossing of the tricuspid valve and improve catheter maneuverability. In this exploratory analysis we used 3D modeling of cross-sectional imaging to measure implantation angles from the IVC and SVC and correlate these features with anthropomorphic traits to aid in procedural planning.

Methods
Data collection/Inclusion Criteria: CT-Angiography scans obtained from 2022-2025 representing a varied pediatric cohort were collected. Patients with structural heart disease or non-diagnostic scans were excluded.
Modeling: 3D Slicer was used to create models from scans via combined automatic segmentation with manual refinement. Pacemaker implant location at the apical third of the ventricular septum was identified. IVC-implant angle (IVCia) and SVC-implant angle (SVCia) were recorded. Virtual implant was performed using high-fidelity pacemaker model created using photogrammetry.
Data analysis: Descriptive statistics for the cohort were completed with grouped comparisons by age, height, weight, and BMI quartiles.

Results
51 patients were included (29 Female [57%], mean age 13 ± 3.7 yrs, height 153 ± 20 cm, weight 56 ± 27 kg, BMI mean 20 ± 7). The mean IVCia was significantly more acute than the SVCia (81 ± 17 vs. 116 ± 12, p < 0.01). IVCia became more acute with increasing age (<10 y (n=11) 100.7 ± 27.2, 10-14 y (n=18) 82.2 ± 14.6, 14-18y (n = 24) 77.5 ± 15.7), p = 0.017) while SVCia was age-invariant. No significant difference in weight, height, or BMI quartiles were noted for IVCia or SVCia. A single patient was noted to have less than 1 cm from the tricuspid valve annulus to the proximal end of the pacemaker.

Conclusion
In this our exploratory analysis, we found that the IVCia was more acute than the SVCia, suggesting that jugular approach may be easier in the majority of pediatric patients. The youngest patients in the cohort had the least acute IVCia, but no other patient characteristics were predictive of implant angle. Future studies correlating readily available studies such as plain chest film to IVCia/SVCia may prove to be of significant benefit. 





3D Modeling and Virtual Implantation of Pediatric Leadless Pacemakers: 
Predictors of Acute Implant Angles

Background
The Model for End-Stage Liver Disease (MELD) score has helped prioritize liver transplant candidates based on disease severity since 2002. Changes to its algorithm rendered MELD 2.0 in 2016 and MELD 3.0 in 2022. The revisions to each model aimed to enhance transplant allocation and equity, but each model’s ability to predict post-transplant outcomes remains unclear.

Methods
Utilizing the Organ Procurement Transplantation Network database, 10 post-transplant outcomes were compared between MELD 1.0 (n=76,732), MELD 2.0 (n=52,615), and MELD 3.0 (n=23,299) cohorts. Binary logistic regression models evaluated the association between MELD cohort and each dichotomous outcome, adjusting for MELD score. MELD 1.0 served as the reference category. Odds ratios (ORs), 95% confidence intervals (CIs), and p-values were reported for comparisons between MELD 2.0 versus MELD 1.0 and MELD 3.0 versus MELD 1.0. Statistical significance was defined as p<0.05. All analyses were conducted using IBM SPSS Statistics, version 29.

Results
MELD 3.0 best predicted an increased risk of graft failure due to infection (OR=1.30, p=0.02), diffuse cholangitis (OR=2.32, p<0.001), hepatic artery thrombosis (OR=2.51, p<0.001), primary non-function (OR=3.93, p<0.001), and overall graft loss (OR=6.34, p<0.001). MELD 3.0 also was the greatest predictor of a decreased risk in chronic rejection (OR=0.67, p=0.041), recurrent disease (OR=0.12, p<0.001), and hepatitis recurrence (OR=0.03, p<0.001). However, an increased risk of acute rejection (OR=1.58, p<0.001) was better predicted by MELD 2.0. Graft failure due to other vascular thrombosis was not significantly predicted by either model.

Conclusion
MELD model revisions may have utility in predicting post-transplant outcomes as evidenced by the 3.0 model best predicting 8 out of the 10 selected outcomes. Further studies should examine the ability of MELD 3.0 to predict male versus female transplant outcomes, as the purpose of the MELD 3.0 revision was to improve equitable distribution of available livers to females.

Investigating the Utility of Each MELD Edition in Predicting Liver Transplant Outcomes

Background
Perforator flaps, like deep inferior epigastric perforator (DIEP) and thoracodorsal artery perforator (TDAP) flaps, use perforating vessels to transfer tissue while sparing underlying muscle and motor nerves in microvascular reconstruction. Obtaining computed tomography angiograph (CTA) studies prior to flap surgeries is the gold standard for identifying appropriate perforators. Although CTA provides high-quality vascular imaging, concerns persist regarding the potential risks of radiation exposure and the financial costs associated with its use. This systematic review assesses how different preoperative imaging methods correlate with complication rates.
Methods
A systematic review was conducted using controlled keywords across multiple databases to identify studies utilizing preoperative CTA imaging in patients undergoing DIEP breast reconstruction published up to 2024. Keywords utilized included ("flap surgeries" OR "flap surgery" OR "flap procedures" OR “DIEP” OR “Autologous breast reconstruction” OR “deep inferior epigastric artery flap”) AND ("preoperative identification" OR "perforator vessels" OR "CTA" OR "Computed Tomography Angiography"). Eligible studies included clinical trials, observational studies, case series, and reports involving patients aged 18 or older. Preferred Reporting Items for Systematic Reviews and Meta-analysis (PRISMA) guidelines were utilized. Each study went through a two-stage review process including an initial title and abstract screening followed by a full-text screening with two reviewers using Covidence software. 19 studies met inclusion criteria and data were abstracted into Excel by study design, total population, preoperative imaging type used, and complications.
Results
Out of 19 studies included, there were 3043 patients included in studies that shared complication rates. 499 patients (16.4%) reported complications during or after surgery. When our analysis was subdivided by preoperative imaging type, 134 of 625 (21.4%) US alone, 115 of 622 (18.5%) CTA alone, and 87 of 603 (14.4%) US + CTA patients reported complications. Of the total 499 patients with complications, 40 (8.0%) suffered complete flap loss, 69 (14%) experienced partial flap loss, and 96 (19%) developed fat necrosis.
Conclusion
Our preliminary analysis demonstrates that studies utilizing CTA alone or with US for preoperative planning reported lower rates of complications when compared to studies using US alone. These findings suggest while preoperative CTA is demonstrated to decrease intraoperative times, it may also be associated with better surgical outcomes in DIEP breast reconstructions. These findings emphasize the need for accurate preoperative perforator identification in minimizing complications and optimizing surgical outcomes.


Evaluating the Efficacy of Preoperative CTA in DIEP Flap Breast Reconstructions

Background
With 890,000 new diagnoses and 450,000 deaths each year, head and neck squamous cell carcinoma (HNSCC) is the seventh most common cancer worldwide. Pathologic extranodal extension (pENE)—defined as histopathologically-evident tumor growth beyond the lymph node capsule—is an important prognostic factor for HNSCC.
pENE+ cancers are more aggressive, more difficult to remove surgically, and more likely to metastasize. Thus, pENE presently serves as an indication for more intensive treatment, including adjuvant chemoradiation. In this study, progression-free survival outcomes were compared by pENE status to determine whether current treatment approaches adequately address the increased risks posed by pENE+ cancer.

Methods
A retrospective review was performed of 146 patients with HNSCC, a subset of the Holden Comprehensive Cancer Center’s BioMER cohort. Patients were excluded if they never received surgical intervention, if their cancer was human papillomavirus (HPV)-positive, or if they presented with recurrent disease originally treated at other institutions.
Data was extracted from clinical records in Epic, stored in a secured REDCap database, and anonymized prior to analysis in SPSS Statistics. Survival outcomes were compared using log-rank tests, while chi-square or Fisher’s exact tests were used for all other analyses.

Results
Patients who were pENE+ had significantly worse progression-free survival outcomes (P < 0.0001) than patients who were pENE-. There was also a trend towards worse overall survival, which did not reach statistical significance (P = 0.2255). Interestingly, macroscopic pENE (>2mm) was associated with significantly worse overall survival compared to microscopic pENE (<2mm) (P = 0.0387).
In investigating correlations with other variables, tumors with poor differentiation (P = 0.0004), advanced T stage (P = 0.0053), or distant metastasis (P = 0.0045) were all significantly more likely to be pENE+.

Conclusion
Despite relatively aggressive treatment regimens, pENE+ patients still suffer from significantly higher rates of recurrence. pENE status was also strongly associated with several other indicators of aggressive tumor behavior.
One limitation of this study was the relatively short follow-up period, which may have limited the statistical power of some analyses.
Further research is needed to determine how we can fulfill this unmet clinical need and improve outcomes for pENE+ patients. One promising approach involves radiologic ENE, which could potentially enable accurate risk stratification and treatment planning from the first diagnostic scan.

Pathologic extranodal extension: an undervalued prognostic factor in head and neck squamous cell carcinoma

Background: Post-COVID-19 complications have been reported in up to 60% of infections globally, contributing to a significant burden on public health and quality of life. Among these complications, persistent immune dysregulation and inflammatory syndromes, such as mast cell activation syndrome (MCAS), have been increasingly recognized. MCAS is characterized by an exaggerated and inappropriate mast cell response, resulting in widespread systemic inflammation and allergic-like symptoms. Understanding these phenomena is critical for improving diagnostic strategies and therapeutic approaches. In this report, we present a rare case of transient MCAS-like hypersensitivity symptoms following COVID-19 reinfection, with a notably intensified symptom presentation compared to the initial infection.

Case Presentation: A 33-year-old male with a past medical history of asthma and obesity presented with unusual post-COVID hypersensitivity symptoms. Following an initial COVID-19 infection two years prior, he developed transient, mild diffuse epidermal pruritus triggered by sugary foods, which resolved spontaneously after two weeks. However, after a second infection in April 2024, he experienced severe hypersensitivity reactions resembling anaphylaxis, including diffuse pharyngeal and distal extremity swelling, pruritic urticaria, dyspepsia, diarrhea, persistent left lower quadrant abdominal and lumbar pain, wheezing, and nausea. Symptoms were triggered by ingestion of nearly all foods except red meats seasoned only with sea salt. Comprehensive evaluation, including upper gastrointestinal biopsy, ruled out celiac disease, and a full allergy panel showed no food allergies. Laboratory workup and physical examination revealed no abnormalities. Symptoms gradually resolved over a four-month period without targeted intervention.

Discussion: MCAS is typified by inappropriate mast cell degranulation, leading to the release of pro-inflammatory mediators and systemic symptoms such as fatigue, gastrointestinal distress, and dermatologic manifestations. Nonspecific mast cell activation following COVID-19 infection remains a rare but increasingly reported complication. In this case, symptom severity was markedly intensified following reinfection compared to the initial episode, reflecting a pattern akin to the immune system’s heightened response following booster COVID-19 vaccinations. We propose that reinfection may further prime mast cells, precipitating an exaggerated inflammatory response and more severe clinical manifestations. The absence of food-specific IgE antibodies supports a non-IgE-mediated hypersensitivity mechanism, consistent with mast cell dysregulation. Although MCAS-like reactions post-COVID are rare, accumulating evidence suggests they are not isolated occurrences. Greater awareness and further studies are warranted to elucidate the pathophysiology, improve diagnostic criteria, and develop effective management strategies to enhance the quality of life for affected patients.

Transient Mast Cell Activation Syndrome-Like Hypersensitivity Following
COVID-19 Reinfection: A Case Report of Intensified Symptomatology

Abstract Title
Halo Nevi with Poliosis: A Scoping Review and Case Report

Background:
Halo nevi (HN) are benign melanocytic nevi surrounded by a depigmented ring, typically occurring on the trunk. Rarely, they may appear on the scalp and can present with poliosis, a localized white patch of hair. This uncommon presentation poses diagnostic and management challenges. We present a case of scalp halo nevi with poliosis in a pediatric patient and review the literature to characterize clinical, histological, and management patterns.

Methods:
A comprehensive literature search was conducted across multiple databases including MEDLINE, CINAHL, Cochrane Collection, and Web of Science, limited to English-language articles through October 2024. Search strategies incorporated relevant Medical Subject Headings (MeSH) and textword searches. Identified citations were screened using Covidence, and relevant case reports were extracted for clinical and histopathologic data.

Results:
Our case involves a 9-year-old female with three pink macules and intralesional white hairs on the scalp. Biopsy confirmed a briskly inflamed intradermal melanocytic nevus consistent with a halo nevus. Follow-up at three months showed persistence of two lesions and spontaneous resolution of one.

Literature review identified six prior cases of halo nevi with poliosis on the scalp and two involving the eyelid. Most patients were children or young adults. Common histopathologic findings included dense dermal lymphocytic infiltrates surrounding melanocytic nests with a decrease in follicular melanocytes in some cases. Dermatoscopy, when reported, showed depigmentation, globules, and poliosis. Treatment was typically conservative, with excision pursued for cosmetic reasons or concern for atypia. No recurrences or adverse outcomes were reported.

Conclusion:
Halo nevi with poliosis are rare, especially on the scalp, and primarily affect children. Though benign, these lesions can mimic pigmentary disorders or melanoma-associated leukoderma. Biopsy remains the diagnostic gold standard, with dermatoscopy serving as a useful adjunct, though underreported in this context.
Current literature is limited to isolated case reports without standardized management or long-term outcomes, and no consistent association with vitiligo has been observed in cases presenting with poliosis. Clinicians should manage these lesions conservatively, offering reassurance and reserving intervention for diagnostic uncertainty or cosmetic concerns. Improved documentation of dermatoscopic and histopathologic findings will enhance recognition and inform future clinical guidance for this uncommon presentation.


Halo Nevi with Poliosis: A Scoping Review and Case Report

A Small Polyp with a Big Impact: Metastatic Duodenal NET Initially Presenting with PE & Pancytopenia

Background
Neuroendocrine tumors (NETs) are rare malignancies emerging from neuroendocrine cells, accounting for <1% of all cancers. The gastrointestinal (GI) tract represents the primary site for these tumors but duodenal NETs (D-NETs) occur exceptionally rarely because they make up only 2% of GI NETs. Typically slow-growing and asymptomatic —especially when <2 cm—these tumors are often discovered incidentally. However, some may metastasize and present atypically. We report a rare case of a metastatic D-NET arising from a 3–4 mm duodenal polyp, initially presenting with pulmonary embolism (PE), pancytopenia, and systemic symptoms.

Case Presentation
A 72-year-old African American woman with hypertension and GERD presented with left arm swelling, generalized weakness, and significant unintentional weight loss. CT angiography revealed bilateral submassive pulmonary emboli and parenchymal lung disease. Doppler ultrasound showed DVTs in the left upper and lower extremities. Labs demonstrated anemia, leukocytosis, and hypoalbuminemia. Given concern for malignancy, a CT-guided lung biopsy identified a well-differentiated grade 2 NET (Ki-67 index 5%) with markers suggestive of GI or pancreatobiliary origin. Bone scan showed osseous involvement, raising concern for widespread metastatic disease and bone marrow suppression contributing to pancytopenia.
Esophagogastroduodenoscopy revealed a 3–4 mm duodenal bulb polyp, which was
confirmed on biopsy as the primary tumor—a well-differentiated grade 2 NET. The
patient was treated with anticoagulation and discharged in stable condition with plans for PET imaging and oncology follow-up.

Discussion
This case illustrates an unusual presentation of metastatic D-NET from a lesion <5 mm in size. While most small duodenal polyps are benign, this case challenges the
assumption that size correlates with clinical risk. The initial presentation with PE and
pancytopenia illustrates the diverse and sometimes misleading ways NETs can
manifest, particularly when metastasized. Diagnosis hinges on histopathologic
confirmation with immunohistochemistry. Although small, localized D-NETs are often cured with endoscopic resection, metastatic cases require systemic therapy and close surveillance. Clinicians should maintain a broad differential when evaluating unexplained hypercoagulability and cytopenias, recognizing that even minute GI lesions can harbor significant malignant potential.

A Small Polyp with a Big Impact: Metastatic Duodenal NET Initially Presenting with PE and Pancytopenia

Gemella Sanguinis is a gram positive, facultative anaerobic bacteria that is normally found in mucosal surfaces of oropharynx, gastrointestinal and genitourinary systems. Gemella species can cause bacteremia and is a rare cause of infective endocarditis particularly in patients with underlying cardiac and valvular disease. The main source of gemella bacteremia is oral from dental infections but has also been reported in patients with colon malignancies. We present an interesting case of Gemella Sanguinis bacteremia with mitral valve endocarditis in a patient with colon cancer.

CASE:

61 year old male with history of rheumatic heart disease, atrial fibrillation, hypertension presented with chief complaints of fevers, chills, cough and shortness of breath for 3 weeks. He had a 15- pack year history of smoking but denied alcohol or substance abuse. There was no family history of malignancies. Upon initial presentation he was hypotensive and required vasopressors for severe sepsis with shock. Broad spectrum antibiotics was initiated for sepsis. Cardioversion was performed since he was noted to be in atrial fibrillation with rapid ventricular response. His blood cultures grew Gemella Sanguinis. After review of the susceptibilities for gemella sanguinis, he was successfully treated with rocephin for 6 weeks. Gentamicin was not administered secondary to concern for acute kidney injury. Transthoracic echocardiogram revealed thickened anterior mitral valve leaflet with diastolic doming consistent with rheumatic valve disease. Transesophageal echocardiogram was performed that showed severe aortic valve stenosis, severe mitral valve stenosis with a 1 X 1.3 cm echo density on the anterior mitral valve leaflet consistent with a vegetation. Aortic and mitral valve replacement with mechanical prosthesis and extensive biatrial modified maze procedure was performed. Panorex films was performed that did not reveal oral source of infection. CT abdomen/pelvis showed diffuse wall thickening involving the sigmoid colon. Colonoscopy was done that revealed colorectal mass and biopsy was consistent with adenocarcinoma. He underwent colorectal resection with loop ileostomy and surgical margins were negative. His hospital course was further complicated by intraabdominal fluid collection and subdural hemorrhage. Oncology was consulted but secondary to low risk for recurrence chemotherapy was not recommended. He underwent colostomy reversal and continues to follow up with oncology.

CONCLUSION:

There are well known association between colon cancers and bacteremia including gemella species as presented above in this patient. Bacteria can enter the blood stream from disruption of the colonic barrier and intestinal dysbiosis. In a patient presenting with gemella sanguinis bacteremia with no clear source, clinicians should consider colonic etiologies and colonoscopy is warranted to search for underlying colonic malignancies. Appropriate timely diagnosis and workup enables early diagnosis and treatment.

Gemella Sanguinis bacteremia with Mitral Valve Endocarditis as a Presenting Sign of Colon Cancer

Background
Corpus callosum infarction is a rare presentation of ischemic stroke, typically manifesting with atypical symptoms such as ideomotor apraxia or interhemispheric disconnection.
Moyamoya disease, a progressive cerebrovascular occlusive disorder, most often results in ischemic events in the MCA and ACA territories.
Roger’s Syndrome, or Thiamine-Responsive Megaloblastic Anemia (TRMA), is a rare autosomal recessive condition characterized by early-onset diabetes, sensorineural deafness, and megaloblastic anemia.
To our knowledge, this is the first reported case of a patient with both Moyamoya disease and Roger’s Syndrome, highlighting potential synergistic risk factors for stroke.

Case Presentation
A 22-year-old female with a history of TRMA, Moyamoya disease, type 1 diabetes mellitus, a left cochlear implant, and multiple prior strokes presented with left leg weakness, aphasia, altered mental status, and new-onset urinary incontinence.

The patient had a recent insulin dose reduction and was found to be in diabetic ketoacidosis (glucose 419 mg/dL, bicarbonate 9.6 mmol/L).
CT of the brain demonstrated hypoattenuation in the genu of the corpus callosum, indicating an acute/subacute infarct, along with chronic bilateral frontal infarcts. MRI was limited due to cochlear implant artifact.

Cerebral angiography revealed progression of Moyamoya disease with occlusion of the ICA, MCA, and A1 segment, and extensive collateralization.
She underwent a combined revascularization procedure with a right STA-MCA bypass and bilateral indirect onlay craniotomies.
Postoperative imaging confirmed evolving infarcts in MCA and ACA territories. Rehabilitation was initiated with moderate functional gains; the patient was ambulating 50 feet with moderate assistance by discharge.

Discussion
This case illustrates an unusual presentation of Moyamoya disease involving the corpus callosum, resulting in a form of Callosal Disconnection Syndrome.
While stroke is a known complication of Moyamoya, infarction of the corpus callosum remains uncommon.
The co-occurrence of TRMA may represent a novel risk enhancer, potentially through mechanisms such as chronic metabolic stress, thiamine deficiency–related microangiopathy, and diabetic endothelial dysfunction.
Diabetic ketoacidosis likely exacerbated cerebral ischemia by further compromising vascular integrity. This case underscores the importance of multidisciplinary management and vigilance for cerebrovascular events in patients with overlapping rare genetic and metabolic conditions.

Roger’s Syndrome and Callosal Disconnection Syndrome in a Stroke Patient: A Case Report

Note: All abstracts must be submitted using this approved template and must not include pictures, graphs, or tables. The abstract must not exceed 400 words, excluding the abstract title, page numbering, or any ancillary entrant information. Citations or references are not a necessity with the abstract. If your abstract is accepted for consideration, you may include citations or references with your poster.

Abstract Title
Prototype for a Predictive Healthcare Inventory Management System

Background
Inefficient medical inventory management significantly burdens healthcare, exacerbating rising hospital expenses, with supplies (22%) and labor (56%) being major drivers. Challenges include high-value items, varied stock, product expiration, manual tracking inefficiencies, and financial implications leading to waste and potential delays in care. Hospitals predominantly use real-time or retrospective systems rather than anticipatory systems. While structured approaches like frequency-based or mathematical modeling within these existing systems can reduce management time, their implementation can be challenging. Existing solutions are not cost-effective, with some systems costing hundreds of thousands of dollars. Other industries leverage machine learning (ML) for large-scale inventory applications, but this approach is largely unapplied in healthcare. We aim to create an ML model for the implementation of a predictive system to streamline the process of inventory management in the hospital setting.

Methods
We created an ML-based forecasting tool to predict monthly and quarterly order quantities for medical supplies using historical data from an academic tertiary care center. Our dataset included information on dates, categories, quantities received, and costs for all item orders from January 2022 to December 2024 for the interventional radiology department. Items ordered fewer than 10 times per year were excluded. For each item, order history and quantities were analyzed, and an ML model was created using Python 3.9 using Random Forest, Gradient Boosting, and XGBoost algorithms, tuning each with GridSearchCV. Models were trained with 10 iterations per item to average predictions and reduce variance. Performance was analyzed with median absolute error (median AE), mean absolute error (MAE), and explained variance score.

Results
Our training data was trained on 26 months of order data, and the testing was done on the subsequent 10 months. Over the 42 items, the Random Forest model showed the best performance with monthly data, resulting in a mean MAE of 5.69 and SD of 4.54. In contrast, Gradient Boosting outperformed other models with quarterly data, resulting in a mean MAE of 6.00 and SD of 4.7.

Conclusion
Our results suggest that an ML model can be utilized in the healthcare inventory setting to optimize item procurement and storage, relieving the burden of inventory from staff and improving efficiency. With our model, we seek to minimize procedure cancellations from a lack of requisite supplies and avoid overstocking. Further iterations will modify model inputs and parameters to improve performance and validate the model using another dataset from other departments and institution-wide orders.


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