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Multiple cutaneous reticulohistiocytosis with T‐cell large granular lymphocyte clonopathy

A 63‐year‐old Caucasian man presented with a 4‐month history of disseminated asymptomatic reddish‐brown papulonodular lesions. A skin biopsy showed dermal infiltration with CD68+ histiocytes, predominantly with eosinophilic cytoplasm, some with a ground‐glass cytoplasm, and a small number of giant cells. The diagnosis of multiple cutaneous reticulohistiocytosis was made. Bone marrow immunophenotyping due to peripheral blood lymphocytosis revealed the presence of a monoclonal population of CD3+, CD8+ CD57+ large granular lymphocytes. The present case suggests the coexistence of multiple cutaneous reticulohistiocytosis with an underlying disorder.