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Herpes zoster — USMLE Step 3 MCQ

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EasyAmbulatory Medicine / Primary CareHerpes zosterUSMLE Step 3

A 68-year-old man has burning pain over the right chest followed by grouped vesicles on an erythematous base. The rash is limited to one thoracic dermatome and does not cross the midline. He has no fever or dyspnea. Which of the following is the most likely diagnosis?

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Reveal the answer and explanation

Correct answer: CHerpes zoster

Painful grouped vesicles in a unilateral dermatomal distribution are characteristic of herpes zoster.

Reference: CDC shingles clinical overview: https://www.cdc.gov/shingles/