A 55-year-old man undergoes an open right inguinal hernia repair. The 'triangle of doom' is a critical region where dissection must be avoided. What structures bound the triangle of doom?

• A Inferior epigastric vessels medially, iliopubic tract inferiorly, peritoneum superiorly
• B Cooper's ligament inferiorly, ilioinguinal nerve medially, vas deferens laterally
• C External iliac vessels medially, inguinal ligament inferiorly, pubic tubercle medially
• D Vas deferens medially, testicular vessels laterally, peritoneal fold superiorly ✓

Explanation

The 'triangle of doom' is a critical anatomical concept in laparoscopic inguinal hernia repair. It is bounded by the vas deferens medially and the testicular (gonadal) vessels laterally, with the apex pointing toward the deep inguinal ring. The external iliac vessels run within this triangle, making blind dissection or staple/tack placement here potentially lethal due to risk of major vascular injury. The 'triangle of pain' is a separate region more lateral, containing the femoral nerve, lateral femoral cutaneous nerve, and genitofemoral nerve.

Reference: Bailey & Love's Short Practice of Surgery, 27th ed.

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Written and medically reviewed by the StethoPrep medical team.