[Domestic infection of neurocysticercosis in a Japanese woman, who had not travelled overseas].

A 52-year-old Japanese woman was found to have a single parenchymal cystic lesion in the operculum of the left frontal lobe. Although she had not travelled overseas, neuroradiological and serological studies supported the diagnosis of neurocysticercosis. Three months after a trial with praziquantel, although the cystic lesion decreased in size on MR imagings, she suddenly developed motor dominant aphasia as a manifestation of epileptic attack. This appears to have followed the death of the cysticercus, releasing the cysticercus contents into the surrounding brain and to have stimulated an intense reactive inflammation. Neurocysticercosis, although rare in Japan, may be positively identified by neuroimaging and serological studies and can be treated conservatively with praziquantel.