Breast Neuroendocrine Neoplasm

**Semantic type:** Neoplastic Process

**Definition:** A neoplasm that arises from the breast and is composed of cells exhibiting neuroendocrine differentiation. It is classified as neuroendocrine carcinoma or neuroendocrine tumor G1 and neuroendocrine tumor G2. Most cases are neuroendocrine carcinomas. Primary neuroendocrine tumors in the breast are very rare.

**Synonyms:** - Breast Endocrine Neoplasm - Neuroendocrine Neoplasm of Breast - Neuroendocrine Neoplasm of the Breast