Poster Author of 1 e-Poster
SE-031 - CT colonography in preoperative T staging of colorectal cancer
Author of 1 Presentation
SE-031 - CT colonography in preoperative T staging of colorectal cancer
Abstract
Purpose
This study was designed to evaluate the usefulness of CT colonography for the assessment of the T stage of colorectal cancer.
Material and methods
CT colonograms obtained from 586 patients with 594 colorectal cancers were reviewed by 2 investigators. Intestinal wall deformity on CT air-contrast enema was classified into the following four categories according to the degree of that: triangular type, arc type, trapezoid type, and apple-core type.
Results
At pathologic examination, we found the following stages: T1(n=74), T2 (n=118), T3 (n=310), and T4 (n=92). The detectability of colonic lesions by CT enema was 98.5% (585/594). As for intestinal wall deformity, triangular type was only seen in T1, the rate of arc type was significantly higher in T1/2 than in T3/4 (58%: 108/185 vs 1%: 3/400 p< 0.0001); the rate of trapezoid type was significantly lower in T1 than in T2 (1%: 1/69 vs 49%: 57/116, p< 0.0005); and the rate of apple-core type was significantly lower in T1/2 than in T3/4 (0%: 0/185 vs 52%: 211/400 p< 0.0001).
Conclusion
As the depth of invasion increased, the grade of deformity became severer. The degree of wall deformity on CT air-contrast enema can provide important information in preoperative T staging of colorectal cancer.