Pop Quiz #99
The correct answer is D. S-100.
Granular cell tumors are benign growths which typically occur on the tongue. They are typically well-circumscribed, raised, firm nodules. Histologically, the cells have uniform nuclear characteristics and granular cytoplasm due to presence of lysozyme. These tumors are PAS positive and S-100 positive.
CD31 stains positive in vascular neoplasms (e.g. angios …