Null Cell Pituitary Neuroendocrine Tumor

**Semantic type:** Neoplastic Process

**Definition:** A non-functioning pituitary neuroendocrine tumor without hormonal immunoreactivity or evidence of specific adenohypophyseal cell derivation.

**Synonyms:** - Hormone Immunonegative Adenoma - Hormone Immunonegative Pituitary Gland Adenoma - Null Cell Adenoma - Null Cell PitNET/Adenoma - Null Cell Pituitary Neuroendocrine Tumor/Adenoma - Transcription Factor-Immunonegative Adenoma