Table 1:

Distribution of the stenotic vessel segments in each segment

Stenosis	ICA	A1	M1	M2	P1	BA	V4	Total
30%–49%	4	11	19	6	2	7	7	56
50%–69%	5	7	17	2	2	9	5	47
70%–99%	4	7	13	2	0	6	5	37
Complete occlusion	2	0	6	1	0	0	0	9
Total	15	25	55	11	4	22	17	149

Note:—BA indicates basilar artery.