Fig. 5From: Giant colonic diverticulum: radiographic and MDCT characteristicsA 92-year-old man with massive pneumoperitoneum due to left colon perforation. CT surview of the abdomen (a) demonstrating the football sign (arrows) that may mimic giant colonic diverticulum. Axial unenhanced CT image through the upper abdomen (b) shows the massive pneumoperitoneum (P)Back to article page