A 53-year-old man presents with a longstanding history of nail abnormalities involving most of his fingernails. The affected nails are thinned, and longitudinal ridging and splitting of the nail plates are observed. His past medical history is unremarkable and he is not taking any medications.
The most likely diagnosis is
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Onychomycosis
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Nail psoriasis
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Traumatic nail injury
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Median nail dystrophy
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Nail lichen planus
Answer on page 1208
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