label: Thymus Neuroendocrine Tumor
label_lc: thymus neuroendocrine tumor
description: 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.