[A case of acranial fetus with placenta partially grown into the bony cranium in pregnancy complicated by carotid artery aneurysm].

It was shown in this paper rarely appearing fetus defect namely,acranial fetus with placenta growing into the osteocranium. The aneurysm of the left carotid artery in the mother was the second complication in this pregnancy what was the indication to finish the pregnancy by cesarean section. The symptoms of osteocranium destruction caused by the trophoblast were not identified. The appearance of so heavy a CNS defect could be associated with deficiency of vitamin compounds particularly folic acid in the periconception period.