Incarcerated left inguinal hernia on CT

The preliminary scout film (A) demonstrates dilated ascending colon (arrow) with a focal narrowing of the distal descending colon in the left inguinal region (arrowhead). There is an air fluid level in the dilated ascending colon (B, arrow). The descending colon is normal in caliber (B, arrowhead). A knuckle of incarcerated bowel in a left inguinal hernia can be seen (arrows in C and D).