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We report a case of a 45-year-old woman with unusual headache 1 week before admission. After cerebrovascular ultrasound, a basilar artery dissection was supposed despite the normal neurologic, cerebrospinal fluid, and computed tomography findings. On a follow-up color-coded duplex sonography (1 month after the onset), reperfusion was detected in the vertebral and basilar arteries, but residual high-grade stenosis of the basilar artery was also present. [ABSTRACT FROM AUTHOR]