title: A small cell tumor.
mesh_terms: D000368:Aged; D002051:Burkitt Lymphoma / Q000175:diagnosis; D018288:Carcinoma, Small Cell / Q000175:diagnosis / Q000473:pathology / Q000648:ultrastructure*; D005260:Female; D006801:Humans; D008854:Microscopy, Electron; D009062:Mouth Neoplasms / Q000175:diagnosis / Q000473:pathology / Q000648:ultrastructure*