Hyper-Reactive Malarial Splenomegaly Syndrome (HMSS).

Hyper-reactive malarial splenomegaly syndrome (HMSS) is a massive enlargement of the spleen due to an exaggerated immune response to repeated attacks of malaria.  Tropical splenomegaly syndrome (TSS) is the most frequent cause of massive tropical splenomegaly in malarious areas [1-2].  It is seen more commonly among residents of endemic areas of malaria.  It occurs mainly in tropical Africa, but also in parts of Vietnam, New Guinea, India, Srilanka, Thailand, Indonesia, South America, and the Middle East. TSS is characterized by massive splenomegaly, hepatomegaly, marked elevations in levels of serum IgM, and malaria antibody.