Question:
Identify the triangle marked in the image below.
Identify the triangle marked in the image below.
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Bile duct confluence, D2-D3 junction and pancreatic neck-body junction outline where gastrinomas live.
Updated On: Jun 23, 2026
- Koch's triangle
- Gastrinoma triangle
- Hesselbach's triangle
- Sherren's triangle
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The Correct Option is B
Solution and Explanation
Step 1: The triangle shown is the gastrinoma triangle, also called Passaro's triangle. It is the anatomical region where most gastrinomas (gastrin-secreting tumours of Zollinger-Ellison syndrome) are located.
Step 2: Its three boundaries are: superiorly, the junction (confluence) of the cystic duct and the common bile duct; inferiorly, the junction of the second and third parts of the duodenum; medially, the junction of the neck and body of the pancreas.
Step 3: Why the distractors are wrong: Koch's triangle lies in the right atrium and bounds the AV node; Hesselbach's triangle is in the inguinal region and is the site of direct inguinal hernias; Sherren's triangle is a zone of skin hyperaesthesia over the right iliac fossa in acute appendicitis. None of these match the hepatobiliary-pancreatic landmarks shown.
Step 2: Its three boundaries are: superiorly, the junction (confluence) of the cystic duct and the common bile duct; inferiorly, the junction of the second and third parts of the duodenum; medially, the junction of the neck and body of the pancreas.
Step 3: Why the distractors are wrong: Koch's triangle lies in the right atrium and bounds the AV node; Hesselbach's triangle is in the inguinal region and is the site of direct inguinal hernias; Sherren's triangle is a zone of skin hyperaesthesia over the right iliac fossa in acute appendicitis. None of these match the hepatobiliary-pancreatic landmarks shown.
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