Subungual tumor on the left index finger with light yellowish discoloration

A 37-year-old man presented with a 5-year history of nail dystrophy on his left index finger. The lesion recently developed intermittent pain and tenderness on the periungual area because of its increase in size and the consequential nail ingrowth. The patient remembered that the mass had enlarged gradually over the past 5 years. He did not recall any trauma before the onset of the nail abnormalities. Previous antifungal therapy and perilesional triamcinolone injection had not led to improvement.

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