From the case:
Dural venous sinuses (illustration)
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Diagram of the dural venous sinuses.
Original image of the skull base created by Patrick J. Lynch, and distributed under Creative Commons Attribution 2.5 license - see case page (http://commons.wikimedia.org/wiki/File:Skull_interior_anatomy.svg) for more info. Dural venous sinuses and labels added by Frank Gaillard.
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