November 2018 — Hematopathology
A 59-year-old man with a history of HIV presented with a 6 cm mass involving the left palatine tonsil. Biopsy of the mass showed the histologic findings seen below. Initial immunohistochemical stains including pankeratin, p63, and S100 were negative.
Additional immunohistochemical stains revealed the following immunophenotype:
|Rosalind Sharain, M.D.
|Linda Dao, M.D.
Consultant, Anatomic Pathology
Assistant Professor of Laboratory Medicine and Pathology
Mayo Clinic College of Medicine