Preoperative T Staging of Colorectal Cancer by CT Colonography

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Abstract

Purpose:

This study was designed to estimate the accuracy of CT colonography for the assessment of T stage in colorectal cancer.

Methods:

CT colonograms obtained from 246 lesions were reviewed by 3 investigators. Intestinal wall deformity on shaded-surface display and rough appearance around the intestine were studied to assess their relations to T stage. Intestinal wall deformity was classified into arc type, trapezoid type, and apple-core type, defined as a trapezoidal wall deformity involving ≥50 percent of the circumference of the lumen.

Results:

As for intestinal wall deformity, the rate of arc type was higher in Tis/T1 than in T2 (74 percent: 17/23vs. 24 percent: 8/34,P< 0.0001); the rate of trapezoid type was 17 percent (4/23) in Tis/T1, 59 percent (20/34) in T2, and 15 percent (28/189) in T3/T4 (Tis/T1vs.T2,P< 0.0001; T2vs. T3/T4,P< 0.0001); and the rate of apple-core type was lower in T2 than in T3/T4 (18 percent: 6/34vs. 81 percent: 154/189,P< 0.0001). Arc type, trapezoid type, and apple-core type were primarily associated with T1, T2, and T3/T4, respectively. When these criteria were used, the overall accuracy for T stage was 79 percent. Rough appearance was specific for T3/T4, but insensitive.

Conclusions:

CT colonography can provide important information for the preoperative assessment of T stage in colorectal cancer.

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