83% in distal portion, 83% enhancement, 98% in advanced stage; The overall accuracy of T staging is 78%, sensitivity and specificity of T1, T2 - 3, T4a, T4b are 100% and 100%, 57% and 98%, 71% and 86%, 89% and 77% respectively; in diagnosing serosal invasion, sensitivity and specificity are 97% and 63%.