title: Oat-cell carcinoma of the thymus.
abstract: Oat-cell carcinoma of the thymus gland is exceedingly rare as a primary lesion, and only a few cases have been reported. We report a case in which a neoplasm interpreted as an oat-cell carcinoma was intimately associated with and arose in transition from a carcinoid tumor of the thymus. Ultrastructural features of this lesion were unusual compared with previous descriptions of thymus neuroendocrine neoplasms.
mesh_terms: D000328:Adult; D002276:Carcinoid Tumor / Q000473:pathology; D018288:Carcinoma, Small Cell / Q000473:pathology* / Q000648:ultrastructure; D002467:Cell Nucleus / Q000473:pathology; D003593:Cytoplasm / Q000473:pathology; D003594:Cytoplasmic Granules / Q000648:ultrastructure; D003599:Cytoskeleton / Q000648:ultrastructure; D003896:Desmosomes / Q000648:ultrastructure; D006801:Humans; D008297:Male; D008479:Mediastinal Neoplasms / Q000648:ultrastructure; D008854:Microscopy, Electron; D009361:Neoplasm Invasiveness; D013953:Thymus Neoplasms / Q000473:pathology* / Q000648:ultrastructure