Preoperative Assessment of External Anal Sphincter Invasion and Para-external Anal Sphincter Invasion in Rectal Cancer Using Magnetic Resonance Imaging

• Ishii M.

  Division of Colon and Rectal Surgery, Shizuoka Cancer Center

• Yuen S.

  Division of Diagnostic Radiology, Shizuoka Cancer Center

• Yamaguchi S.

  Division of Colon and Rectal Surgery, Shizuoka Cancer Center

• Morita H.

  Division of Colon and Rectal Surgery, Shizuoka Cancer Center

• Saito S.

  Division of Colon and Rectal Surgery, Shizuoka Cancer Center

• Oota M.

  Division of Colon and Rectal Surgery, Shizuoka Cancer Center

• Morimoto K.

  Division of Colon and Rectal Surgery, Shizuoka Cancer Center

• Okumoto T.

  Division of Colon and Rectal Surgery, Shizuoka Cancer Center

• Hashimoto M.

  Division of Colon and Rectal Surgery, Shizuoka Cancer Center

Bibliographic Information

Other Title

• 外肛門括約筋に浸潤あるいは近接する直腸癌の術前ＭＲＩ診断

Abstract

PURPOSE: The aim of this study was to assess the accuracy of preoperative magnetic resonance imaging for the prediction of external anal sphincter invasion and para-external anal sphincter muscle invasion in lower rectal cancer patients.<BR>METHOD: Twenty-six patients with lower rectal cancer who underwent curative abdomino-perineal resection were investigated. The para-external anal sphincter invasion was defined when tumor was observed within 1mm from the inter rim of the external anal sphincter muscle. We established the criteria for external anal sphincter invasion on magnetic resonance imaging. Preoperative magnetic resonance imaging was compared with pathological results prospectively.<BR>RESULT: External anal sphincter invasion was seen in only two patients, and para-external anal sphincter invasion was seen in 7 of the 26 patients histologically. Accuracy of preoperative magnetic resonance imaging for detecting external and para-external anal sphincter invasion was a sensitivity of 89% and a specificity of 82%.<BR>CONCLUSION: Preoperative magnetic resonance imaging could be useful for detecting external and paraexternal anal sphincter invasion in rectal cancer patients.

Journal

• Nippon Daicho Komonbyo Gakkai Zasshi

  Nippon Daicho Komonbyo Gakkai Zasshi 59 (7), 367-372, 2006

  The Japan Society of Coloproctology

Keywords

• 直腸癌
• Intersphincteric resection
• 外肛門括約筋浸潤
• MRI

Details

• CRID: 1390001204854810624
• NII Article ID: 10018260527
• NII Book ID: AN00195100
• DOI: 10.3862/jcoloproctology.59.367
• ISSN: 18829619
• ISSN: 00471801
• Web Site: http://www.jstage.jst.go.jp/article/jcoloproctology1967/59/7/59_7_367/_pdf
• Web Site: https://search.jamas.or.jp/link/ui/2006204918
• Text Lang: ja
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed