Pituicytoma

**Semantic type:** Neoplastic Process

**Definition:** An extremely rare, WHO grade 1, circumscribed and slow-growing tumor that arises from the neurohypophysis or infundibulum and described in adults. It is characterized by the presence of elongated, spindle-shaped neoplastic glial cells that form storiform patterns or interlacing fascicular arrangements. Signs and symptoms include visual disturbances, headache, amenorrhea, and decreased libido.

**Synonyms:** - PITUICYTOMA, BENIGN - Pituicytoma (WHO Grade 1) - Pituicytoma (WHO Grade I) - Posterior Pituitary Astrocytoma