Fig 1.

A 70-year-old woman presenting with acute onset of headache and left-sided weakness. A, Noncontrast head CT scan demonstrates a large right frontoparietal lobar hemorrhage with surrounding vasogenic edema. This hemorrhage was subsequently shown to be due to a right hemispheric arteriovenous malformation with intranidal and flow-related aneurysms. B, CT scan caudal to A demonstrates calcification of the right caudate and anterior putamen, with sparing of the anterior limb of the internal capsule. C, Axial T2 MR image at a similar level demonstrates normal to slightly decreased signal intensity in the right caudate and putamen. Mild sulcal effacement in the right hemisphere is due to mass effect from the more superior parenchymal hematoma. Despite this, the right frontal horn is mildly dilated compared with the left. D, Axial T1 postgadolinium image demonstrates a DVA involving the right caudate and putamen. This DVA drains into an ependymal vein, likely the right thalamostriate vein, which is partly included on this image (arrow).