title: Extrapulmonary oat-cell carcinoma of the tongue: an electron-microscopic study.
abstract: An extrapulmonary oat-cell carcinoma arose in the tongue of a 62-year-old man who had a long history of cigarette smoking and ethanol ingestion. At presentation, he had the primary tongue lesion and cervical lymph-node metastases only, and search for a pulmonary primary was negative. Ten months later he died with metastases to liver, cerebrum, ribs, vertebrae, calvarium, and clavicle. Electron microscopy demonstrated cells with cytoplasmic processes and many dense-core neurosecretory granules that had a tendency to concentrate in the processes. Cells were linked by desmosomes. Electron microscopy is necessary for definitive diagnosis of extrapulmonary oat-cell carcinomas.
mesh_terms: D018288:Carcinoma, Small Cell / Q000473:pathology / Q000648:ultrastructure*; D003593:Cytoplasm / Q000648:ultrastructure; D006801:Humans; D008207:Lymphatic Metastasis; D008297:Male; D008855:Microscopy, Electron, Scanning; D008875:Middle Aged; D009940:Organoids / Q000648:ultrastructure; D014062:Tongue Neoplasms / Q000473:pathology / Q000648:ultrastructure*