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Supratentorial dural venous channel characteristics, based on review of 100 consecutive angiograms
  No. %
Patients with supratentorial dural venous channels 26 26
No. of supratentorial dural venous channels 29 29
Average dural venous channel length (mm) 20  
No. of dural venous channels on right side 19 66
Dural venous channel, female patients 20 77
Overall No. of females in angiographic sample 63 63
Location of supratentorial dural venous channel^{^a}    
 Posterior temporal 19 66
 Parietal 4 14
 Occipital 6 21
↵a Excludes “dural venous lakes” and vertex falx cerebri channels.

	No.	%
Patients with supratentorial dural venous channels	26	26
No. of supratentorial dural venous channels	29	29
Average dural venous channel length (mm)	20
No. of dural venous channels on right side	19	66
Dural venous channel, female patients	20	77
Overall No. of females in angiographic sample	63	63
Location of supratentorial dural venous channel^{^a}
Posterior temporal	19	66
Parietal	4	14
Occipital	6	21