Table 1. Frequency (%) and severity (MRA score) of vascular involvement evaluated on magnetic resonance angiography (MRA).

MRA score	Rt. MCA	Lt. MCA	Rt. ACA	Lt. ACA	Rt. PCA	Lt. PCA
0	12.9	45.2	45.2	41.9	87.1	87.1
1	16.1	22.6	22.6	22.6	6.5	3.2
2	71.0	32.3	32.3	35.5	6.5	9.7

Rt: right, lt: left, MCA: middle cerebral artery, ACA: anterior cerebral artery, PCA: posterior cerebral artery. For the MRA score, three grades were classified based on MRA data as follows: 0, normal/mild stenosis; 1, moderate stenosis (majority of distal branches are visible); 2, severe stenosis/occlusion (majority of distal branches are not visible).