Angiostrongylus cantonensis is a parasite which causes Angiostrongyliasis,which is the most common cause of eosinophilic meningitis.This parasite may become infected to human through ingestion of larvae by contaminated water, vegetables etc.The larva is then transported through the blood to the central nervous system, where they are the most common cause of eosinophilic meningitis.The diagnosis of Eosinophilic Meningitis can be arrived at through detection of elevated cranial pressure and increased numbers of eosinophils.Review articles are the summary of current state of understanding on a particular research topic.