Sphenoidal Emissary Foramen

In the base of the skull, in the great wings of the sphenoid bone, medial to the foramen ovale, a small aperture, the sphenoidal emissary foramen, may occasionally be seen (it is often absent) opposite the root of the pterygoid process. When present, it opens below near the scaphoid fossa. Vesalius was the first to describe and illustrate this foramen, and it thus sometimes bears the name of foramen Vesalii (meaning foramen of Vesalius). Other names include foramen venosum and canaliculus sphenoidalis.

Read more about Sphenoidal Emissary Foramen:  Importance, Morphology and Morphometry

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Sphenoidal Emissary Foramen - Morphology and Morphometry - Asymmetry
... Though the sphenoidal emissary foramen is small and variable, it is consistently symmetrical ... In a large number of cases, the foramen was remarkably symmetric, and where there was asymmetry, it signified abnormality in four of the six cases ... fistula with drainage through the emissary veins, and neurofibromatosis ...