Table 1.

Age- and sex-matched controls (ranging from 2 years older to 7 years younger) were selected if there was no evidence of brain vascular abnormalities on CTP ordered for clinical indications listed below.

	Age (year); sex	Clinical CT indication	DVA location and description	Figures
Case 1	50; female	Right facial numbness	Juxtacortical left frontal lobe DVA with a superficial collecting vein	Fig. 5Fig. 1
Control 1	49; female	Prior increased T2 signal in pons on MRI	No abnormalities	Fig. 1
Case 2	63; male	Carotid bruit preoperative assessment	Juxtacortical left frontal lobe DVA with a superficial collecting vein	Fig. 3
Control 2	62; male	Headaches	Mild cerebral atrophy consistent with age
Case 3	64; male	Prior abnormal CT scan	Subcortical right cerebellar hemisphere DVA with 4 dilated intramedullary veins that converge into a superficial draining vein near lateral right transverse venous sinus	Fig. 4
Control 3	66; male	Rule out vertebral artery stenosis	Mild cerebral atrophy consistent with age. Vertebral artery calcification not causing stenosis
Case 4	28; male	Evaluation of a possible AVM identified on MRI	Subcortical left parietal region DVA and deep collecting vein
Control 4	21; male	History of carbon monoxide exposure	No abnormalities
Case 5	29; female	History of carbon monoxide exposure	Left juxtacortical frontal lobe DVA with a superficial collecting vein
Control 5	29; female	History of carbon monoxide exposure	No abnormalities

Controls were analyzed to provide baseline values and comparison of case hemispheric CTP values