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MR venograms of the torcular herophili associated with occipital sinuses.
A, Occipital sinuses (arrows) are present on both sides, which serve as alternative drainage pathways from torcular herophili to internal jugular veins. This is associated with absence of both transverse and sigmoid sinuses.
B, Right occipital sinus (arrow) is associated with atretic right transverse sinus.
