We herein report a case of lesser sac herniation through a defect in the transverse mesocolon. In addition to CT signs suggestive of bowel obstructions, there are some characteristic CT findings in this extremely rare type of internal herniation, which include clustering of distended jejunal segments directly compressing the pancreas, displacement of the stomach anterolaterally, displacement of the transverse colon anteriorly and a normal appearance around the foramen of Winslow.