Skull fractures through parietal foramina: report of two cases.

Enlarged parietal foramina are related to a condition in which defective intramembranous ossification of the parietal bones results in enlargement of the normal foramina. Although generally believed to be a benign variant, scalp defects, seizures, and structural brain abnormalities have been reported in a small percentage of affected patients. These 2 cases now present evidence that parietal foramina constitute structural weak spots in the calvarium that may potentially increase risk of skull fracture after trauma.