Mycology/Parasitology USMLE Step 1 Practice Question
A 29-year-old woman with type 2 diabetes presents with a painful, draining foot ulcer. Vital signs show temperature 38.2°C, heart rate 102/min, blood pressure 128/82 mmHg, and oxygen saturation 98% on room air. The ulcer contains black necrotic tissue with purulent drainage. Culture grows a filamentous organism branching at acute angles; histopathology shows hyphal invasion without septation. She denies recent antibiotic use. Which organism is most likely responsible for this infection?
Answer choices
- AEumycetoma caused by Madurella mycetomatis
- BChromomycosis caused by Fonsecaea pedrosoi
- CSporotrichosis caused by Sporothrix schenckii
- DMycetoma caused by Nocardia asteroidesCorrect answer
- EAspergilloma caused by Aspergillus fumigatus
- FActinomycosis caused by Actinomyces israelii
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