Thymus Neuroendocrine Tumor

**Semantic type:** Neoplastic Process

**Definition:** A well-differentiated neuroendocrine neoplasm that arises from the thymus and is often associated with Cushing syndrome. Two morphologic subtypes are recognized: grade 1 (G1-typical carcinoid tumor) and grade 2 (G2-atypical carcinoid tumor). Grade 2 neuroendocrine tumors have a more aggressive clinical course.

**Synonyms:** - Carcinoid Tumor of Thymus - Carcinoid Tumor of the Thymus - Thymic Carcinoid - Thymic Carcinoid Tumor - Thymic Neuroendocrine Tumor - Thymus Carcinoid - Thymus Carcinoid Tumor