Diagnosis: Onychomycosis. (Tinea unguium)
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Clinical diagnosis: Onychodystrophy r/o Onychomycosis.
Specimen: Toenail clipping.
Stain: PAS (Periodic acid Schiff)
Observe: Numerous fungal hyphae in the zone of shaggy, subungual hyperkeratosis, along the undersurface of the nail plate.
Links to Pub Med
Methods of Diagnosis: A comparison
Nail clippings: Histopathologic diagnosis with PAS stain
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