Toxoplasma Gondii is a protozoan parasite which causes multisystem affections and unusual clinical outcomes. Although primo- infection takes place frequently during childhood, there is a possibility for it to be found during pregnancy, when it could lead to congenital toxoplasmosis, with serious ocular and cerebral lesions (that can be identified during ultrasound). The positive diagnostic for the mother is made after a serologic test and for the fetus the parasite can be found in the amniotic fluid during amniocentesis. A prompt treatment can avoid the presence of cerebral lesions (hydrocephalus, ventriculomegaly, intracerebral calcifications).