Lesser sac hernia

Dr Henry Knipe et al.

Lesser sac hernias 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 1, 2.

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

Risk factors
Plain radiograph
  • gas-filled loops of small bowel in the upper abdomen
CT
  • 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 caecal position
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Article Information

rID: 32168
Section: Pathology
Tag: cases
Synonyms or Alternate Spellings:
  • Foramen of Winslow hernia
  • Epiploic foramen hernia
  • Winslow's foramen hernia
  • Lesser sac herniation

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Cases and Figures

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    Case 1: formen of Winslow (lesser sac) internal hernia
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