Mycology/Parasitology USMLE Step 1 Practice Question
A 53-year-old man with acute myelogenous leukemia undergoing chemotherapy presents with pleuritic chest pain and hemoptysis during severe neutropenia (WBC 0.8 K/μL). Vital signs show BP 128/82, HR 102, RR 22, Temp 38.2°C, SpO2 94% on room air. Chest CT reveals multiple nodular lesions with surrounding ground-glass opacity. Lung biopsy demonstrates septate hyphae branching at acute angles. He denies recent antifungal prophylaxis. Which organism is most likely responsible?
Answer choices
- ABlastomyces dermatitidis
- BCandida albicans
- CMucor species
- DCryptococcus neoformans
- EAspergillus fumigatusCorrect answer
- FCoccidioides immitis
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