Clinical and Radiological Difficulties to Detect Isolated MCA Dissection before Intravenous tPA Therapy.

A 64-year-old woman was admitted to our hospital 48 minutes after sudden onset of dysphasia and right hemiplegia. Head computed tomography revealed small infarcts in the left putamen and 4-dimensional computed tomography angiography depicted high-degree stenosis in the left middle cerebral artery and delayed filling of the contrast media in the left middle cerebral artery territory. The patient underwent intravenous tissue plasminogen activator treatment. On day 5 of hospitalization, the patient underwent conventional cerebral angiography, revealing internal carotid artery to middle cerebral artery dissection. Fortunately, subarachnoid hemorrhage as an adverse effect did not occur, although iv-tPA was administered without detecting middle cerebral artery dissection.