title: Metastatic tumors of unknown origin: an ultrastructural analysis of 265 cases.
mesh_terms: D000230:Adenocarcinoma / Q000175:diagnosis / Q000556:secondary; D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000951:Antigens, Neoplasm / Q000032:analysis; D001706:Biopsy; D002277:Carcinoma / Q000175:diagnosis / Q000556:secondary; D005260:Female; D006801:Humans; D008297:Male; D008854:Microscopy, Electron; D008875:Middle Aged; D009362:Neoplasm Metastasis / Q000175:diagnosis / Q000276:immunology / Q000473:pathology*; D009382:Neoplasms, Unknown Primary / Q000175:diagnosis / Q000473:pathology*
chemical_list: D000951:Antigens, Neoplasm