Anatomy

Epiploic Foramen

Anatomy

/eh-pip-loh-ik fuh-ray-men/

Eponym: Foramen of Winslow

Structure:

The epiploic foramen, also known as the omental foramen, is situated within the peritoneal cavity. It is the opening that connects the greater sac with the lesser sac (omental bursa), allowing for fluid and potential organ movement between these compartments. It is located directly posterior to the hepatoduodenal ligament, which contains the portal triad.[1] The foramen’s location, lying between the hepatoduodenal ligament and the inferior vena cava, places it at a significant crossroad of vascular and gastrointestinal structures. Because the portal triad lies within the anterior border of the epiploic foramen, any inflammatory or pathological condition affecting these vessels can have implications, such as the extension of infections via the epiploic foramen, for the peritoneal cavity.[2]

The epiploic foramen can be located by running a finger laterally to medially along the gallbladder to the free edge of the hepatoduodenal ligament. The foramen usually admits two fingers.[1] Its identification is essential for accessing the lesser sac, managing internal hernias, and avoiding iatrogenic injuries during procedures involving the liver, pancreas, or biliary system, making it a critical anatomical landmark in surgery.

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Function:

The epiploic foramen allows movement of fluid, immune cells, and pressure between the greater and lesser sacs of the peritoneal cavity. This communication permits the lesser sac to accommodate changes in volume and pressure, facilitating normal movement of adjacent organs such as the stomach and intestines.[2]

Clinically, the epiploic foramen is significant in cases of internal herniation, as loops of intestine may herniate through this opening and cause intermittent or acute bowel obstruction.[2] Its position posterior to the portal triad is also essential in surgical practice. During severe hepatic bleeding, compression of the hepatoduodenal ligament at the foramen can temporarily occlude the portal triad vessels, providing hemorrhage control during operative management.[2] Additionally, inflammatory processes or infections within one peritoneal compartment may spread through the foramen to the other, highlighting its relevance in peritonitis.[2]

References:

Moore KL, Dalley AF, R. AAM. Clinically Oriented Anatomy. Wolters Kluwer; 2018.
Thomas JM, Van Fossen K. Anatomy, Abdomen and Pelvis: Foramen of Winslow (Omental Foramen, Epiploic Foramen). In: StatPearls. http://www.ncbi.nlm.nih.gov/books/NBK482186/

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