USMLE® Step 1 style questions USMLE
USMLE® Step 2 style questions USMLE
A 21-year-old man comes to the clinic because his toenail has been disfigured for the past few weeks. Physical exam shows a fungal infection of his toenail, as seen below. KOH preparation verifies that it is a distal subungual onychomycosis. Which of the following fungi is the most likely cause of his infection?