Pineocytoma

**Semantic type:** Neoplastic Process

**Definition:** A WHO grade 1 slow growing tumor, more frequently affecting young adults. It is composed of small, uniform, mature cells resembling pineocytes with occasional large pineocytomatous rosettes. It may show a wide range of divergent phenotypes, including neuronal, glial, melanocytic, photoreceptor and mesenchymal differentiation. Pineocytoma generally has a relatively favorable prognosis. (Adapted from WHO)

**Synonyms:** - Benign Pinealoma - Benign Pinealoma - Benign neoplasm of pineal gland - PINEOCYTOMA, BENIGN - Pinealocytoma - Pineocytoma (WHO Grade 1) - Pineocytoma (WHO Grade I) - pineocytoma