Gross Anatomy USMLE Step 1 Practice Question
A 34-year-old man presents to the emergency department following a stab wound to the right fifth intercostal space at the midaxillary line. Vital signs show BP 110/68 mmHg, HR 102 bpm, RR 18/min, and SpO2 98% on room air. Chest X-ray reveals a small right-sided pneumothorax without hemothorax. He denies dyspnea and breath sounds are present bilaterally. Which of the following structures is most likely damaged by this penetrating thoracic injury?
Answer choices
- ARight atrium
- BLiverCorrect answer
- CUpper lobe of right lung
- DSuperior vena cava
- ERight pulmonary artery
- FDiaphragm
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