title: High incidence of urinary bladder involvement in carcinomas of the sigmoid and rectum: a retrospective review of 580 patients with colorectal carcinoma.
abstract: OBJECTIVE
  It is not uncommon for colorectal carcinomas to invade the urinary bladder. However, the actual incidence of urinary bladder invasion of colorectal carcinomas and the common sites of the original tumors are still unclear.
  
  
  METHODS
  The clinical records of 580 patients diagnosed with colorectal carcinoma were retrospectively reviewed. A further review of patients with urinary bladder invasion was performed.
  
  
  RESULTS
  Of the 580 patients, 17 (2.9%) had a diagnosis of urinary bladder invasion intraoperatively. The incidence of bladder involvement was significantly higher in carcinomas of the sigmoid and rectum than in carcinomas of other colon segments (4.1 vs. 0.5%, P = 0.017). Although a combination of computed tomography (CT) and cystoscopy predicted 80% of the bladder involvement, preoperative diagnostic modalities could not provide information for the differentiation between macroscopic and pathological invasion or the necessity for total cystectomy.
  
  
  CONCLUSIONS
  The sigmoid colon and rectum were common sites of the original tumors invading the urinary bladder compared with other colon segments. CT and cystoscopy are recommended for preoperative screening of the bladder involvement of sigmoid colon and rectal cancer. However, it appeared to be difficult to predict the pathological invasion of malignant cells and the necessity for total cystectomy preoperatively.
authors.affiliation: Department of Urology, Kobe City General Hospital, Chuo-ku, Kobe, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Kobayashi
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Kamoto
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Sugino
authors.forename: Hideo
authors.initials: H
authors.lastname: Takeuchi
authors.forename: Tomonori
authors.initials: T
authors.lastname: Habuchi
authors.forename: Osamu
authors.initials: O
authors.lastname: Ogawa
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003113:Colonoscopy; D015653:Cystectomy; D003558:Cystoscopy; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009361:Neoplasm Invasiveness; D011860:Radiography, Abdominal; D012004:Rectal Neoplasms / Q000473:pathology* / Q000601:surgery; D012189:Retrospective Studies; D012811:Sigmoid Neoplasms / Q000473:pathology* / Q000601:surgery; D014057:Tomography, X-Ray Computed; D001749:Urinary Bladder Neoplasms / Q000473:pathology* / Q000601:surgery