Fig 3.

A 48-year-old woman presenting with headache and seizure. A, An axial source image from CTA demonstrates mineralization of the right caudate and anterior putamen, with sparing of the anterior limb of the internal capsule. The patient's noncontrast head CT (not shown) also demonstrated this finding. An adjacent developmental venous anomaly (white arrows) is demonstrated in the periventricular white matter, coursing toward the midline. B, Lateral-projection venous phase image from a catheter angiogram demonstrates the venous radicles of the DVA converging toward a common venous pouch (P). A focal stenosis (large black arrow) manifested as a caliber transition zone is present where the pouch meets the inferior sagittal sinus; a second possible stenosis is present at the point where the inferior sagittal sinus drains to the Galenic system.