RESUMEN
Computed tomographic [CT] colonography is a noninvasive, rapidly evolving technique that has been shown in some studies to be comparable with conventional colonoscopy for the screening of colorectal cancer. The addition of intravenous contrast material to CT colonography can aid differentiation of true colonic masses from pseudolesions such as residual stool and improves the depiction of enhancing masses that might otherwise be obscured by residual colonic fluid. The aim of this study is to assess the role of multi detector computed tomographic colonography in staging of colo-rectal neoplasm and detection of synchronous lesons such as adenomatous polyp. The study included fifty-five patients with suspected colo-rectal neoplasm and underwent MDCT colonography and fibro-optic colonoscopy on the same day. The MDCT colonography with IV contrast media has 94% accuracy for identifying tumor wall invasion by colorectal carcinoma and 71% accuracy for identifying regional lymph nodes involvement and the sensitivity of both MDCT colonography and fibro-optic colonoscopy equal in detection of polyps more than 5 mms. The contrast enhanced MDCT colonography is an excellent investigating tool in staging of colo-rectal neoplasm in detection of synchronous adenomatous polyps more than 5 mms