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FIG 1. Abnormal vascular signal intensity was seen in the left jugular bulb, inferior petrosal sinus, and cavernous sinus.
A, 3D time-of-flight cranial arterial MR angiogram of the first patient shows high signal intensity in the left cavernous sinus together with the left inferior petrosal sinus and internal jugular vein at the level of the jugular bulb (arrows).
B, MR angiogram of the second patient shows abnormal flow-related enhancement in the left inferior petrosal sinus because of a fistula (arrowhead, cavernous sinus; double arrowheads, inferior petrosal sinus; arrow, jugular bulb).
C, Subvolumetric reconstructed maximum intensity projection image of the third patient shows more details of the inferior petrosal and cavernous sinuses (arrowheads, cavernous sinus; arrows, inferior petrosal sinus).
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