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Interactive Case Study - October 2025





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Acknowledgements
Author Profiles
Phuoc Christie-Nguyen, MD
University of Texas Health Science Center
Phuoc Christie-Nguyen, MD, is a dedicated pathology resident at The University of Texas Health Science Center at Houston. His work emphasizes dermatopathology and cutaneous malignancies, driven by personal and professional passion. Dr. Christie-Nguyen is recognized for his scholarly contributions, including case reports and publications, and was recently honored with the Texas Society of Pathologists Education Foundation Scholarship. His commitment to excellence is reflected in his leadership, research, and dedication to advancing pathology.

Thuy Phung, MD, PhD
University of Texas Health Science Center
Thuy Phung, MD, PhD is professor and medical director of molecular pathology at the University of Texas Health Science Center at San Antonio. She is spearheading efforts to enhance molecular diagnostics for cancer patients in South Texas. She is the lead author of Pediatric Dermatopathology, a comprehensive textbook in the field. Dr. Phung pursues translational research in vascular anomalies in children, with a focus on identifying key molecular pathways that drive the development and growth of these lesions and developing new therapy targeting these pathways. In addition to her clinical and scientific work, Dr. Phung is passionate about global health. She is a co-founder of the award-winning Vascular Anomalies Center in Ho Chi Minh City, Vietnam, which cares for thousands of underserved children with vascular anomalies. Dr. Phung also leads a program in global pathology to enhance the standards of dermatopathology practice in Vietnam.

Xiaohong Iris Wang, MD, PhD
I am currently an associate professor working at both university and community hospital. With many years of basic research background and advanced training, I am actively involved in research of tumor microenvironment. By practicing both hematopathology and surgical pathology, I am with broad knowledge in the field. In last 5 years, I am a coauthor of 14 peer reviewed papers. I also published many abstracts with trainees and visiting scholars.
Question:
85-year-old man with purpuric macules and papules at the abdomen, hips, and bilateral lower legs
Category
Tumors > Lymphomatous/Leukemic Infiltrates
Description