Coexistence of pemphigus foliaceus and mycosis fungoides.

Mycosis fungoides was documented in a patient two years after pemphigus foliaceus had been diagnosed and treated with corticosteroids. Eight years later, the patient was found to have stage IV lymphomatous disease with generalized erythroderma and palpable, histologically positive lymph nodes. Hematoxylin-eosin staining of a specimen of erythroderma revealed mycosis fungoides, while direct immunofluorescence of this tissue revealed intercellular IgG deposits diagnostic of pemphigus foliaceus.