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AIM:To compare the accuracy of hydrocolonic sonography(HUS) in determining the depth of invasion (T stage) in colonand rectal cancer.METHODS:A total of 1000-2000 mL of saline was instilledper rectum using a system for barium enemas,and thenultrasonography was conducted by a SSA-270A (ToshibaCo,Japan) sonolayer unit with a 3.75 MHz for 17 patientswith colon cancer and 13 patients with rectal cancer beforeoperation.After operation,T stage in HUS was comparedwith postoperative histological findings.RESULTS:Overall,the accuracy of T stage was 70%.Itwas 88% in colon cancer and 46% in rectal cancer.Inevaluating nodal state,the accuracy of HUS was low inboth colon (71%) and rectal cancers (46%) compared withconventional CT or MRI.The overall accuracy of N stagingwas 60%.CONCLUSION:HUS is valuable to evaluate the depth ofinvasion in colon cancer,but is less valuable in rectalcancer.Because HUS is low-cost,noninvasive,and readilyavailable at any place,this technique seems to be usefulto determine the preoperative staging in colon cancer,butnot in rectal cancer.
AIM: 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 1000-2000 mL of saline was instilledper rectum using a system for barium enemas, and thenultrasonography 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 surgery. After operation, T stage in HUS was compared with postoperative histological findings .RESULTS: Overall, the accuracy of T stage was 70%. Itwas 88% in colon cancer and 46% in rectal cancer. In evaluating nodal state, the accuracy of HUS was low inboth colon (71%) and rectal cancers (46%) compared with conventional CT or MRI. overall accuracy of N stagingwas 60% .CONCLUSION: HUS is valuable to evaluate the depth of invasion in colon cancer, but is less valuable in rectalcancer.Because HUS is low-cost, noninvasive, and chemically available at any place, this technique seems to be use useulto determi ne the preoperative staging in colon cancer, butnot in rectal cancer.