Fig 4.

A 39-year-old man with a history of antithrombin III deficiency, presenting with headache and suspicion for intracranial hemorrhage. Some years earlier, the patient had been told that he had a “right basal ganglia hemorrhage.” A, Noncontrast head CT demonstrates unilateral mineralization of the right caudate and anterior putamen, with relative sparing of the anterior limb of the internal capsule, which can be seen between the caudate and putaminal mineralization. B, Axial fluid-attenuated inversion recovery MR image shows no hyperintensity in the right caudate or putamen but rather a subtle hypointensity due to the calcification. The right frontal horn is mildly dilated, consistent with subtle volume loss in the right basal ganglia. C, Axial T1 postgadolinium image demonstrates a deep DVA involving the right basal ganglia and draining toward a right subependymal vein and then to the right septal vein (arrow). A second more superficial DVA is present in the subcortical right frontal region. Mild asymmetric prominence of the right frontal ventricular horn is again consistent with subtle parenchymal volume loss.