This tumor is from the pineal region a 50-year-old man. Additional helpful information: GFAP is largely negative, TTF-1 is negative, and the Ki-67 labeling index was quite low. Much thanks to our esteemed Dr. Magaki for sending us this case!
Cytokeratin (CAM5.2) immunohistochemical stain
Epithelial membrane antigen (EMA) immunohistochemical stain