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Absence of the left transverse sinus and a persistent occipital sinus.
A, Coronal MIP from axial MRV shows that the superior sagittal sinus continues as the right transverse sinus (small arrows). Straight sinus (asterisks) courses upward to the high-riding torcula, which drains downward into the occipital sinus. Large arrows and O indicate bifurcation of the occipital sinus at the foramen magnum.
B, Axial MIP shows the occipital sinus bifurcating (arrows, O) and draining into the IJVs.
