Altered Hemodynamics Associated with Pathogenesis of the Vertebral Artery Dissecting Aneurysms

Table 2

The three types of VA with comparison of affected and nonaffected sides.

		Affected side
		Type I	Type II	Type III
Non-affected side	Type I	11 (9)	7 (7)	17 (5)
	Type II	6 (4)	1 (1)	0 (0)
	Type III	11 (10)	2 (2)	0 (0)
	None	1 (0)	0 (0)	1 (1)
	Total	29 (23)	10 (10)	18 (6)

The location of the dissection with reference to the distance from the union of the vertebral artery was evaluated, with a distance less than 1 cm counted as near.
( ): near the union.