Systemic mastocytosis associated with Hodgkin’s lymphoma in a 4‐year‐old child

Systemic mastocytosis with associated clonal hematologic non‐mast cell lineage disease (SM‐AHN) represents a specific subtype of mastocytosis and is extremely rare in children. We describe a 4‐year‐old child with systemic mastocytosis associated with Hodgkin's lymphoma. The child had cutaneous mastocytosis and lymphadenopathy without other clinical features of SM, which was diagnosed only by bone marrow examination.