title: Comparison of hydrocolonic sonograpy accuracy in preoperative staging between colon and rectal cancer.
abstract: OBJECTIVE
  To compare the accuracy of hydrocolonic sonography (HUS) in determining the depth of invasion (T stage) in colon and rectal cancer.
  
  
  METHODS
  A total of 1 000-2 000 mL of saline was instilled per rectum using a system for barium enemas, and then ultrasonography was conducted by a SSA-270A (Toshiba Co, Japan) sonolayer unit with a 3.75 MHz for 17 patients with colon cancer and 13 patients with rectal cancer before operation. After operation, T stage in HUS was compared with postoperative histological findings.
  
  
  RESULTS
  Overall, the accuracy of T stage was 70%. It was 88% in colon cancer and 46% in rectal cancer. In evaluating nodal state, the accuracy of HUS was low in both colon (71%) and rectal cancers (46%) compared with conventional CT or MRI. The overall accuracy of N staging was 60%.
  
  
  CONCLUSIONS
  HUS is valuable to evaluate the depth of invasion in colon cancer, but is less valuable in rectal cancer. Because HUS is low-cost, noninvasive, and readily available at any place, this technique seems to be useful to determine the preoperative staging in colon cancer, but not in rectal cancer.
authors.affiliation: Department of Internal Medicine, Yonsei University College of Medicine, C.P.O Box 8044, Seoul, 120-752, South Korea.
authors.forename: Hye Won
authors.initials: HW
authors.lastname: Chung
authors.forename: Jae Bock
authors.initials: JB
authors.lastname: Chung
authors.forename: Seung Woo
authors.initials: SW
authors.lastname: Park
authors.forename: Si Young
authors.initials: SY
authors.lastname: Song
authors.forename: Jin Kyung
authors.initials: JK
authors.lastname: Kang
authors.forename: Chan Il
authors.initials: CI
authors.lastname: Park
mesh_terms: D000328:Adult; D000368:Aged; D003110:Colonic Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology / Q000601:surgery; D019160:Endosonography / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging / Q000379:methods*; D011300:Preoperative Care; D011446:Prospective Studies; D012004:Rectal Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology / Q000601:surgery