title: [Case of carcinoid tumor of the breast].
abstract: A 74-year-old female with a left breast mass was admitted to the Cancer Institute Hospital and underwent mastectomy. Upon study of a frozen section, a diagnosis of breast carcinoma was made. Histopathological examination revealed a non-invasive tumor whose slightly eosinophilic rich cytoplasm was positive for PAS and Alcian-green staining and argyrophilic staining. The tumor showed medullary arrangement, partly with glandular and rosette-like structures. Electron microscopically, many dense core granules (170 +/- 30 nm in diameter) were diffusely distributed in almost all the tumor cytoplasm, they were thought to be neurosecretory granules. A diagnosis of mucocarcinoid of the breast was made. The patient experienced no dyshormonal disorder during the course of the disease and is alive and well without recurrence.
mesh_terms: D000368:Aged; D001943:Breast Neoplasms / Q000473:pathology* / Q000648:ultrastructure; D002276:Carcinoid Tumor / Q000473:pathology* / Q000648:ultrastructure; D005260:Female; D006801:Humans