innere Hernie durch das Foramen epiploicum

Lesser sac hernias (alternative plural: herniae) are a type of internal hernia, where abdominal contents protrude through the foramen of Winslow, hence they are also known as foramen of Winslow hernia.


Lesser sac hernias are rare, accounting for <0.1% of abdominal hernias and 8% of internal hernias .

Risk factors


Typically contains small bowel only (~67%) but may also contain cecum/ascending colon and less commonly transverse colongallbladder, or omentum.

Radiographic features

Plain radiograph
  • gas-filled loops of small bowel in the upper abdomen
  • mesenteric fat/vessels posterior to portal vein, common bile duct, hepatic artery and anterior to the inferior vena cava
  • mesenteric vessels passing into the lesser sac via the foramen of Winslow
  • gas and/or fluid in the lesser sac with bird beak sign towards the foramen of Winslow
  • abnormal cecal position

Differential diagnosis

History and Etymology

It is named after Jacques Benigne Winslow (1669-1760), a Danish-born French anatomist.

Siehe auch: