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Question

Difficulty: HardCardiothoracic and Vascular Surgery

Match each traumatic clinical presentation and its associated physical exam findings to the most likely specific vascular injury.

  • A 24-year-old male sustains a stab wound just below the angle of the mandible. He presents with an expanding hematoma, right-sided ptosis, and miosis.Internal carotid artery injury
  • A 35-year-old male involved in a high-speed frontal collision exhibits a widened mediastinum on chest radiography. Computed tomography angiography reveals a pseudoaneurysm just distal to the origin of the left subclavian artery.Blunt thoracic aortic injury (aortic isthmus)
  • A 12-year-old boy falls from a tree, sustaining a severe, displaced extension-type supracondylar fracture of the humerus. His hand is cold and pale, with no palpable radial pulse even after closed reduction.Brachial artery injury
  • A 22-year-old football player suffers a severe hyperextension injury to the knee, resulting in a posterior tibiofemoral dislocation. He has an absent dorsalis pedis pulse and an ankle-brachial index of 0.7.Popliteal artery injury

Answer

The correct matches align specific mechanisms of traumatic injury and physical exam findings with their corresponding anatomical vascular vulnerabilities.
Each trauma scenario describes a classic anatomical vulnerability. Zone III neck injuries frequently involve the internal carotid artery, commonly accompanied by Horner syndrome. Rapid deceleration most commonly tears the aorta at the isthmus due to tethering by the ligamentum arteriosum. Supracondylar fractures threaten the anteriorly located brachial artery. Knee dislocations place massive traction on the firmly anchored popliteal artery.

Step-by-Step Solution

1
Analyze the penetrating neck trauma presentation.
Stab wound at the angle of mandible (Zone III) with Horner syndrome.
Identifies internal carotid artery injury due to its location and its direct anatomic proximity to the sympathetic chain.
2
Analyze the deceleration trauma presentation.
Widened mediastinum with an injury distal to the left subclavian artery.
Identifies the aortic isthmus, the most tethered portion of the thoracic aorta, as the classic site of blunt thoracic aortic injury.
3
Analyze the pediatric orthopedic trauma presentation.
Supracondylar humerus fracture with a persistent pulseless, pale hand.
Identifies brachial artery compromise, as this vessel runs immediately anterior to the distal humerus.
4
Analyze the knee dislocation presentation.
Posterior knee dislocation with absent distal pulses and a low ankle-brachial index.
Identifies popliteal artery injury, as this vessel is rigidly anchored across the popliteal fossa and highly susceptible to traction.

Key Concept

Anatomical vulnerability of specific blood vessels to traumatic injuries based on distinct mechanisms (e.g., tethering points, proximity to fractures, and anatomic zones).
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Topics

Cardiothoracic and Vascular Surgery

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