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Regressing atypical histiocytosis and lymphomatoid papulosis: variants of the same disorder?

We report a patient with lymphomatoid papulosis who developed a lesion with the clinicopathological features of regressing atypical histiocytosis. Immunohistochemical studies supported a T‐cell histogenesis and many of the atypical cells demonstrated BerH2 (Ki‐1 antigen) positivity. The case supports the view that regressing atypical histiocytosis and lymphomatoid papulosis are different manifestations of the same disease spectrum.