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Virtual Pediatric Hospital: Paediapaedia: Posterior Parietal Variants (Enlarged Parietal Foramina) Paediapaedia: Neurological Diseases

Posterior Parietal Variants (Enlarged Parietal Foramina)

Michael P. D'Alessandro, M.D.
Peer Review Status: Internally Peer Reviewed

Clinical Presentation:
Not applicable

The parietal bones often have small defects, called parietal foramen, that are 1mm or less in diameter, and that allow emissary veins to join the sagittal sinus interiorly with the occipital venous branches externally. Occasionally these defects may be large, as the result of irregular ossification of the membranous bone. Over time they become smaller and obliterate. They should be considered a normal variant.

Not applicable

Imaging Findings:
Large posterior defect in parietal bones, may be unilateral or bilateral, may be symmetrical.


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