title: [Analysis of 643 colorectal cancer patients diagnosed by total colonoscopy].
abstract: OBJECTIVE
  To evaluate the value of colonoscopy in the diagnosis of colorectal cancer.
  
  
  METHODS
  The data of colonoscopy in 1751 patients from May 2003 to June 2006 were retrospectively analyzed.
  
  
  RESULTS
  Of these 1751 colonoscopies, 643 colorectal cancers (36.7%) were detected. The age of most patients was between 40 and 60 years, and hematochezia was the major syndrome for these patients. 351 patients (54.6%) had lump type, 211 (32.8%) ulcerous type, 81 (12.6%) ulcerous infiltration type. 511 colorectal cancers (79.5%) originated from the rectum or sigmoid colon. Simultaneous double primary carcinoma was found in 15 cases (2.3%). Multiple primary cancer was observed in 2 cases. Furthermore 254 colorectal cancers (39.5%) were found to have concurrent colorectal polyps.
  
  
  CONCLUSIONS
  Colonoscopy of total colon and rectum is very helpful in diagnosis of colorectal cancer, which can reduce the rate of misdiagnosis and improve the survival.
authors.affiliation: Department of Endoscopy, Cancer Hospital, Harbin Medical University, Harbin 150081, China. wangguonian609cn@yahoo.com.cn
authors.forename: Hua-Xing
authors.initials: HX
authors.lastname: Wu
authors.forename: Li
authors.initials: L
authors.lastname: Han
authors.forename: Li-Jie
authors.initials: LJ
authors.lastname: Song
mesh_terms: D000230:Adenocarcinoma / Q000175:diagnosis* / Q000473:pathology; D003106:Colon / Q000473:pathology; D003111:Colonic Polyps / Q000175:diagnosis / Q000473:pathology; D003113:Colonoscopy / Q000379:methods*; D015179:Colorectal Neoplasms / Q000175:diagnosis* / Q000473:pathology; D003951:Diagnostic Errors; D005260:Female; D006471:Gastrointestinal Hemorrhage / Q000175:diagnosis; D006801:Humans; D008297:Male; D008875:Middle Aged; D009378:Neoplasms, Multiple Primary / Q000175:diagnosis*; D012007:Rectum / Q000473:pathology; D012189:Retrospective Studies