Fig. 1From: Risk factors of postoperative cerebral hyperperfusion syndrome and its relationship with clinical prognosis in adult patients with moyamoya diseaseIllustration of moyamoya vessels concentration. A Mild stenosis of M1 segment (arrow) and no moyamoya vessels formed. B Severe stenosis of M1 segment (arrow) and smoke vessels formed but sparsely (circle). C Extensive moyamoya vessels formed and expanded in all directions (circle)Back to article page