Malformations of the skull bones occur in impaired development of the embryo or fetus in the antenatal period. They are discovered at birth or in early childhood, and more often at child’s examination. Malformations of the skull bones described in the article were in the form of parietal foramina and were diagnosed accidentally without any child’s active complaints. However, at the CT scan of child’s father, a similar defect was found in his skull parietal bones. So, it can be stated that such a defect has a genetic predisposition.