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Parietal foramina enlarged

Parietal foramina are normal openings towards the posterior and medial part of the parietal bones through which the emissary veins pass.  These normally close around the veins during fetal development, but can remain large because of deficient ossification.  In many cases a suture perpendicular to the saggital suture divides much of the parietal bones, termed "cranium bifidum".