烟雾病亦称大脑动脉环闭塞症。此症并非罕见，在日本发生率较高，患者近半数见于１５岁以下。 病例例１，１９８５年生，女，７岁起病，９岁确诊，主诉左上下肢肌力减退。７岁时每当哭叫或兴奋时四肢无力，每月１～２次发作但不伴意识消失，持续１０～１５分钟自然恢复。１年后 Moyamoya disease also known as cerebral artery occlusive disease. This disease is not uncommon, a higher incidence in Japan, nearly half of patients seen in 15 years of age. Case 1, born in 1985, female, aged 7 years old, diagnosed at age 9, complained of left lower extremity muscle weakness. 7-year-old when crying or excited when limbs weakness, 1 to 2 episodes per month but not with loss of consciousness, sustained 10 to 15 minutes of natural recovery. 1 year later