title: The pattern of infiltration at the proximal border of hilar bile duct carcinoma: a histologic analysis of 62 resected cases.
abstract: OBJECTIVE
  To clarify the importance of different patterns of infiltration at the proximal border of hilar bile duct carcinomas.
  
  
  BACKGROUND
  There are few detailed pathologic studies on the proximal resection margins in patients with hilar bile duct carcinoma.
  
  
  METHODS
  Serial sections of 62 specimens of resected hilar bile duct carcinoma were examined histologically to determine the involved layers and routes of invasion at the proximal border. The degree of cancer extension was determined, and the relation between the length of the tumor-free resection margin and postoperative anastomotic recurrences was analyzed.
  
  
  RESULTS
  Mucosal extension was predominant in papillary and nodular tumors, but submucosal extension was predominant in diffusely infiltrating and nodular-infiltrating tumors. Submucosal extension usually consisted of direct or lymphatic invasion. The mean length of submucosal extension was 6.0 mm. Superficial spread of cancer, defined as mucosal extension of more than 20 mm from the main lesion, was seen in 8 specimens. No patient had an anastomotic recurrence when the tumor-free resection margin was greater than 5 mm.
  
  
  CONCLUSIONS
  The pattern of infiltration at the proximal border of resected hilar bile duct carcinomas is closely related to the gross tumor type. The length of submucosal extension is usually less than 10 mm. Superficial spread of cancer is seen in more than 10% of cases. A tumor-free proximal resection margin of 5 mm appears to be adequate in hilar bile duct carcinoma.
authors.affiliation: First Department of Surgery, Nagoya University School of Medicine, Japan.
authors.forename: E
authors.initials: E
authors.lastname: Sakamoto
authors.forename: Y
authors.initials: Y
authors.lastname: Nimura
authors.forename: N
authors.initials: N
authors.lastname: Hayakawa
authors.forename: J
authors.initials: J
authors.lastname: Kamiya
authors.forename: S
authors.initials: S
authors.lastname: Kondo
authors.forename: M
authors.initials: M
authors.lastname: Nagino
authors.forename: M
authors.initials: M
authors.lastname: Kanai
authors.forename: M
authors.initials: M
authors.lastname: Miyachi
authors.forename: K
authors.initials: K
authors.lastname: Uesaka
mesh_terms: D000328:Adult; D001650:Bile Duct Neoplasms / Q000473:pathology* / Q000601:surgery; D001653:Bile Ducts, Intrahepatic; D018281:Cholangiocarcinoma / Q000473:pathology* / Q000601:surgery; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009361:Neoplasm Invasiveness