Neoplastic C-Cell Hyperplasia

**Semantic type:** Neoplastic Process

**Definition:** A neoplastic process arising from the C-cells of the thyroid gland. It is considered a precursor of hereditary medullary thyroid gland carcinoma, and it is associated with mutations of the RET gene.

**Synonyms:** - ADENOMA, C-CELL, BENIGN - Parafollicular Cell Adenoma - stage 0 medullary thyroid carcinoma in situ