April 2020 — Gastroenterology & Surgical
14 year old female presents with an abdominal/mesenteric based mass as resected.
Immnohistochemical stains demonstrate strong cytokeratin AE1/AE3 (A) and trypsin (B) positivity within the tumor cells. Synaptophysin is negative while chromogranin is focally and weakly positive in the malignant population. B-catenin fails to show nuclear expression. The tumor cells are negative for SALL4, KIT, SF1, OCT4, NUT and inhibin. INI1 and BRG1 are retained.
|Stefan Brettfeld, D.O.
Fellow, Surgical Pathology
|Rondell Graham, M.B.B.S.
Consultant, Anatomic Pathology
Associate Professor of Laboratory Medicine and Pathology
Mayo Clinic College of Medicine and Science