title: Renal cell carcinoma presenting as epistaxis.
abstract: A case of renal cell carcinoma presenting as a nosebleed of three-week duration is described. Light microscopy of a nasal lesion showed a richly vascular tumor, forming glands and uniformly consisting of clear cells. Cytochemically and ultrastructurally, the presence of abundant lipid droplets and glycogen within the neoplastic cells indicated a renal origin. An extended clinical search for a primary kidney tumor was undertaken in view of a negative intravenous tomographic pyelography and renal scan findings. An angiogram finally revealed an intrarenal mass which was proven pathologically as a renal cell carcinoma.
mesh_terms: D000230:Adenocarcinoma / Q000175:diagnosis* / Q000473:pathology / Q000648:ultrastructure; D004844:Epistaxis / Q000209:etiology*; D006003:Glycogen / Q000378:metabolism; D006801:Humans; D007680:Kidney Neoplasms / Q000175:diagnosis / Q000473:pathology / Q000648:ultrastructure; D050356:Lipid Metabolism; D008112:Liver Glycogen / Q000378:metabolism; D008297:Male; D008875:Middle Aged; D009669:Nose Neoplasms / Q000175:diagnosis* / Q000473:pathology / Q000556:secondary / Q000648:ultrastructure
chemical_list: D008112:Liver Glycogen; D006003:Glycogen