Hemophagocytic lymphohistiocytosis associated with visceral leishmaniasis: a case report.

Leishmania-associated hemophagocytic lymphohistiocytosis is a rare clinicopathological entity. This condition is often difficult to diagnose, so treatment is often delayed. This report describes the case of a 5-year-old boy who was admitted with fever of 1 month's duration, hepatosplenomegaly, and pancytopenia. Serum testing showed elevated transaminase levels, hypertriglyceridemia, hyperferritinemia, and normal fibrinogen level. Hemophagocytic lymphohistiocytosis was diagnosed on bone marrow examination. The patient was tested for various infectious agents. He was negative for all except Leishmania, which was detected by indirect fluorescent antibody testing. Treatment with amphotericin B resulted in a dramatic resolution of all signs and symptoms within 1 week.