AANP Case of the Month: August 2026

Title:  30-year-old male with cerebellar mass 

Author(s):  Drs. Peter Kobalka and Krishna Bharani

Institution: The Ohio State University, Department of Pathology

Clinical History: 30 yo Male, hx insidious ataxia and HAs who presented to the ED with acute severe worsening HA and N/V. 

Radiology: Imaging revealed a large, enhancing, cerebellar intraparenchymal mass. 

Representative Histology / IHC: Histology is shown. 

Questions for Viewers: (examples below)

1)      What is the differential diagnosis for this lesion?

2)      What immunohistochemical stains would help with the differential diagnosis?

3)      What is your final diagnosis?