Enlarged parietal foramina is an inherited condition of impaired skull development. It is characterized by enlarged openings (foramina) in the two bones (parietal bones) that form the top and sides of the skull. This condition is due to problems with bone formation (ossification) within the parietal bones. The openings are symmetrical and circular in shape, with variable size ranging from a few millimeters to several centimeters wide. Parietal foramina are a normal feature of fetal development, but they usually close by the fifth month of pregnancy.

human_phenotype

Openings in parietal bones, Holes in parietal bones

HP:0002697