"Ask the Expert” features answers by our experts to your clinical questions. Question: Part 1 What are the best current therapies for the rare sarcoma hemangiopericytoma?Answer: Hemangiopericytoma is an extremely rare sarcoma pathologically most closely related to other vascular sarcomas. Intracranial occurrences have often been treated like meningiomas, whereas some studies have grouped hemangiopericytomas with malignant solitary fibrous tumors. However, due to their clinical rarity, there are...