Abstract

Eosinophilc meningitis is a rare clinical entity that can be useful in narrowing the differential diagnosis of central nervous system. The causes of eosinophilic meningitis are diverse: parasite infection, fungal infection, idiopathic hypereosinophilic syndrome, and Hodgkin's disease. But the most common cause of eosinophilic meningitis is invasion of the central nervous system by helminthic parasites, particularly Angiostrongylus cantonensis. And the most cases have occurred in Southeast Asia and throughout the Pacific basin, which are endemic areas. We report a patient with primary eosino- philic meningitis without eosinophilia.