The value of CT in the preoperative evaluation of the rectal carcinoma.

概要

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Accurate determination of the extent of tumor is essential for the proper surgical management of rectal cancer. CT was carried out preoperatively on 81 patients with rectal cancer in order to determine the extent of neoplasm. Diagnostic accuracy of CT in determining the invasion depth of neoplasm was 50 % in the rectosigmoid, 88 % in the upper rectum, 84 % in the lower rectum and 77 % in the anal canal. As to the accuracy of CT in detecting the pararectal lymph node metastasis, accuracy rate was 67.1 %, false positive was 13.7 % and false negative was 19.2 %. Nodal lymph node swelling demonstrated by CT was thought to be important finding in determining the pararectal lymph node involvement. <BR>The highly infiltrative carcinoma of the rectum was characterized by the cloudy or radiative shadow arround the neoplastic mass demonstrated in CT imaging. CT is useful device for the preoperative determination of tumor extension of the rectal carcinoma.
日本大腸肛門病学会の論文