Neuromuscular Disorders USMLE Step 1 Practice Question
A 41-year-old woman presents with progressive ptosis and intermittent diplopia worsening throughout the day. She reports difficulty sustaining arm elevation above her head after prolonged activity. Vital signs: BP 118/76, HR 82, RR 14, Temp 37°C, SpO2 98% on room air. Edrophonium transiently improves her symptoms. Serum anti-acetylcholine receptor antibodies are positive. Chest CT is most likely to demonstrate which of the following associated findings?
Answer choices
- ACalcified pleural plaques
- BHilar lymphadenopathy with noncaseating granulomas
- CAnterior mediastinal thymic abnormalityCorrect answer
- DApical cavitary lesion with caseation
- EPosterior mediastinal neuroblastoma
- FAnterior mediastinal lymphadenopathy with widened mediastinum
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