Fig. 2
From: Barium enema findings in total colonic aganglionosis: a single-center, retrospective study
Images show common and typical radiographic signs of preoperative BEs in patients with HD. a Rectosigmoid index ≤ 1, obtained by dividing the widest diameter of the rectum by the widest diameter of the sigmoid loop (arrows). b Transitional zone, regarded as the site of obvious caliber change from nondilated to dilated bowel (arrows). c Irregular contraction, resulted from denervation hyperspasticity of the distal segment with a sawtooth configuration (arrows). d Microcolon, a small-caliber colon with the largest diameter less than 1 cm (arrow)