Fig 4.

A, A 63-year-old woman with acute basilar artery thrombosis. B and C, After recanalization of the artery with a Penumbra System (Penumbra, Alameda, California) (B), an acute ischemic lesion of the right thalamus can be seen on the ACT images (C). There is no complication in the form of an IPH or SAH. Typical ring artifacts can be seen on ACT and should not be confused with areas of cerebral edema. D, The follow-up MDCT after 2 hours confirms the thalamic infarction but also depicts a right occipital lobe infarction, which was undetectable on the ACT examination.