title: Spontaneous renal pelvic tumor in an aged rat.
mesh_terms: D000818:Animals; D002295:Carcinoma, Transitional Cell / Q000648:ultrastructure / Q000662:veterinary*; D007680:Kidney Neoplasms / Q000648:ultrastructure / Q000662:veterinary*; D007682:Kidney Pelvis; D008297:Male; D008854:Microscopy, Electron; D051381:Rats; D011919:Rats, Inbred Strains; D012376:Rodent Diseases / Q000473:pathology*