1, migraine; 2, patent foramen ovale; 3, large infarct; 4, occlusion of the main trunk of the posterior inferior cerebellar artery; 5, entrapment; 6, various vasculitis, especially nip arteritis and infectious arteritis; 7, melas; 8, CADASIL; 9, venous infarction; 10, reversible posterior cerebral white matter syndrome; 11, infarction due to vasospasm after SAH; 12, arteriovenous fistula combined with venous infarction; 13, hemorrhagic conversion of cerebral infarction; 14, occlusion of the penetrating artery due to severe hypertension.