Intracerebral aneurysms are rare. However they are potentially life-threatening. Today by means of ultrasound investigations these malformations can occasionally be identified prenatally. In these cases questions of intrauterine therapy, mode and time of delivery and postnatal treatment have to be discussed with the parents. We describe two cases with prenatal diagnosis of intracerebral arteriovenous malformations, diagnostic workup, therapeutic options and fetal outcome.