Scientific paperPreoperative staging by multidetector-row computed tomography in patients with rectal carcinoma
Section snippets
Patients and methods
This study was conducted from January 2000 to April 2001. Twenty patients with rectal carcinoma underwent both MDCT and CCT preoperatively. There were 14 males and 6 females with a mean age of 62.5 years (range 37 to 83), The tumor was located in the upper rectum in 7 patients, the middle rectum in 4 patients, and the lower rectum in 9 patients. Operative procedures were high anterior resection in 3 patients, low anterior resection in 11 patients, abdominoperineal resection in 3 patients,
Results
All patients tolerated both MDCT and CCT examinations without any complications. The tumor detection rate was 100% (20 of 20) for MDCT, and 65% (13 of 20) for CCT. CCT revealed all 10 tumors occupying more than three quarters of the rectal wall circumference regardless of tumor location, however, it detected 3 of 10 tumors occupying less than half circumference. Furthermore, these 3 tumors were located in the posterior wall of the rectum. CCT could detect only 1 of 5 low T-stage (Tis/T1/T2)
Comments
Thoeni et al [5] reported that CT could detect all tumors in 39 patients examined, whereas none of these patients had stage I (intraluminal mass without wall thickening) tumor. Adalsteinsson et al [6] reported that 74% of 53 tumors was detected without using a rectal balloon, and the tumor detection rate was improved up to 85% by using a rectal balloon with axial slices. Thompson [7] reported that tumor detection with axial planes was possible in 88% of cases, when oral or rectal contrast was
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