Immature PIT1 Lineage Pituitary Neuroendocrine Tumor

**Semantic type:** Neoplastic Process

**Definition:** An immature pituitary neuroendocrine tumor composed of PIT1-lineage adenohypophyseal cells with cytologic atypia and limited differentiation towards thyrotroph, somatotroph, and/or lactotroph cells. (WHO)

**Synonyms:** - Immature PIT1 Lineage PitNET/Adenoma - Immature PIT1 Lineage Pituitary Neuroendocrine Tumor/Adenoma