Eosinophilic meningitis in a child raising snails as pets.

The rat lungworm (Angiostrongylus cantonensis) is the principal cause of eosinophilic meningitis or meningoencephalitis worldwide. It is endemic in Taiwan and the Asia Pacific area. We report the case of a 10-year-old boy who was referred to us suffering from intermittent headache, low-grade fever and blurred vision of 4-5 days' duration. He had been treated for gastroenteritis just prior to referral. The patient's history was unremarkable, except that he raised snail (Ampullarium canaliculatus) as pet at home. On physical examination, the patient's consciousness was alert and well oriented. No papilledema was found on fundal examination. The neurological examination revealed normal cranial nerve function, mild weakness of both lower limbs and normal deep tendon reflexes, but positive Babinski and Kernig signs. Laboratory findings showed peripheral eosinophilia, elevated immunoglobulin E level, cerebrospinal fluid eosinophilic pleocytosis and the presence of stage 3 A. cantonensis larvae, which confirmed the diagnosis of eosinophilic meningitis. A 2-week course of mebendazole combined the glucocorticosteroids was beneficial in relieving headache, paresthesia and the other eosinophilic meningitis symptoms in the patient.