On an axial MRI at the level of the foramen of Winslow (epiploic foramen), the structure forming its anterior boundary is:

• A Inferior vena cava
• B Hepatoduodenal ligament (portal triad) ✓
• C Caudate lobe of the liver
• D First part of duodenum

Explanation

The epiploic foramen (of Winslow) has the hepatoduodenal ligament (containing portal vein, hepatic artery, and common bile duct) as its anterior boundary. The posterior boundary is the inferior vena cava covered by peritoneum, the superior boundary is the caudate lobe, and the inferior boundary is the first part of the duodenum. Cross-sectional imaging at this level identifies these relations for surgical safety during hepatobiliary procedures.

Reference: BD Chaurasia's Human Anatomy, 8th ed.

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Written and medically reviewed by the StethoPrep medical team.