title: Metastatic biliary polypoid thrombus from renal cell carcinoma: report of a case.
abstract: We report an extremely rare case of metastatic biliary polypoid thrombus with hepatic metastases from renal cell carcinoma. A 74-year-old man was admitted with a low-grade fever and obstruction of the left hepatic duct. He had undergone left nephrectomy 17 years previously due to a diagnosis of renal cell carcinoma. A preoperative diagnosis of left hepatic duct carcinoma was made, and a left lobectomy and left caudate lobectomy with right biliary anastomosis of jejunal loop were performed. The resected specimen showed a polypoid mass in the left hepatic duct with metastases in the caudate lobe, and a histological examination revealed both tumors to be clear cell-type renal cell carcinoma. The mechanism of biliary metastatic thrombus formation was speculated to be as follows: caudate lobe metastases invade the adjacent bile ducts, and a tumor fragment in the bile duct then becomes implanted in the intraluminal left hepatic duct, thus leading to the growth of the biliary polypoid thrombus.
authors.affiliation: Department of Surgery, Hata Hospital, Hitachi, Ibaraki, Japan.
authors.forename: Kazumitsu
authors.initials: K
authors.lastname: Ueda
authors.forename: Masaki
authors.initials: M
authors.lastname: Ohori
authors.forename: Jun-ichi
authors.initials: J
authors.lastname: Taka
authors.forename: Mitsuo
authors.initials: M
authors.lastname: Kusano
mesh_terms: D000368:Aged; D001650:Bile Duct Neoplasms / Q000473:pathology / Q000556:secondary*; D002292:Carcinoma, Renal Cell / Q000473:pathology / Q000556:secondary*; D006500:Hepatic Duct, Common / Q000473:pathology; D006801:Humans; D007680:Kidney Neoplasms / Q000473:pathology*; D008113:Liver Neoplasms / Q000556:secondary*; D008297:Male