Papillary Tumor of the Pineal Region

**Semantic type:** Neoplastic Process

**Definition:** A rare tumor that arises from the pineal region and affects adults. It is characterized by the presence of neuroepithelial cells and a papillary architecture. Electron microscopic studies suggest ependymal differentiation. The clinical course is variable.

**Synonyms:** - PTPR - Papillary tumor of the pineal region