[Hydranencephaly and congenital toxoplasmosis. Apropos of 4 cases].

Four cases of congenital toxoplasmosis with hydranencephaly are reported. The anatomic lesions are the consequence of ischemic necrosis and foetal hydrocephalus. The risk of such lesions is highest during the second trimester of pregnancy. The preventive steps against congenital toxoplasmosis are recalled.