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.