There is twisting of sigmoid colon and its mesentery at the point of obstruction with retro-grade gross dilatation of the sigmoid and proximal large intestines, measuring up to 10.4 cm in maximum diameter at the level of descending colon which is best appreciated on the coronal images. Mild mesenteric oedema is noted. No CT evidence of underlying mass lesion is seen.
No air-fluid level is seen.
Prostate gland is enlarged in size.