Valoración de los signos radiológicos más frecuentes relacionados con el cáncer colorrectal, obtenidos mediante la técnica de doble contraste

Abstract

Objectives To determine the sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV) of the main radiologic signs on the double-contrast technique in the diagnosis of colorectal cancer. Material and methods We retrospectively analyzed axial slices and clinical histories of 132 patients of whom 18 (13.64%) were diagnosed with colorectal cancer. Results The mean age of the patients with colorectal cancer was 61 years; 11 (61.11%) were male and 7 (38.89%) were female. According to Dukes’ classification, 1 (5.55%) patient had stage A disease, 3 (16.66%) stage B, 8 (44.44%) stage C, and 6 (33.33%) stage D. We detected polyps in 100% of the images obtained by subtraction and diverticula in 100% of those obtained by addition. The distribution by colon segments was as follows: ascending colon n=2 (11.11%), transverse colon n=4 (22.22%), descending colon n=2 (22.22%), sigma n=6 (33.33%), and rectum n=4 (22. 22%). The diagnostic accuracy of the technique was sensitivity 83.33%, specificity 99.25%, PPV 88.24%, and NPV 97.39%. Conclusions Colorectal cancer is more common in people older than 50 years. Polyps on subtraction and diverticula on addition are the most common radiologic signs in colorectal cancer when the double-contrast technique is used. The principal radiologic signs on the double-contrast technique are highly sensitive and highly specific for the diagnosis of colorectal cancer.