Abstract
Hyperreactive malarial splenomegaly (HMS) is the chronic stage of a long-term stimulation of the immune system secondary to plasmodial infections, more frequently in genetically predisposed patients. HMS is a leading cause of large tropical splenomegaly in endemic zones but has been described in immigrants from Africa and in some European expatriates living in endemic countries. Diagnostic criteria include: long-term stay in a endemic zone, often large splenomegaly, high IgM titer, high antiplasmodial antibody titer, regression by at least 40% of splenomegaly six months after curative antimalarial treatment. In tropical settings, B-cell lymphoma and splenic lymphoma are the main differential diagnoses, which may be identified by a clonality analysis. Recent studies suggest that HMS can be treated by a short-term antimalarial therapy as long as the patient resides out of a malarial endemic country.
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