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FIG 7. Narrowing at the junction of the sigmoid sinus and the IJV seen in >60% of patients older than 24 months.
A, Parasagittal subvolume MIP from coronal MRV shows marked luminal narrowing at this junction (long arrow). Note the prominent posterior condylar vein (short arrow).
B, Comparative digital subtraction angiogram, venous phase. Long arrow indicates the narrowed junction; short arrow, a prominent posterior condylar vein.
C, Narrowed junction not associated with a prominent posterior condylar vein in another patient. Arrow indicates loss of signal intensity in the posterior aspect of the superior sagittal sinus due to in-plane flow; coronal MRV was performed.
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