Case Report A 56-year-old woman presented with posterior cervical pain, vertigo, left peripheral facial palsy, left facial sensory loss, left hearing loss, and left ataxia immediately after she bent her head back in the supine position. Diffusion-weighted MRI on admission revealed hyperintensity in the left anterior inferior cerebellar artery (AICA) territory. Digital subtraction angiography showed bilateral vertebral artery (VA) dissection, and the artery supplying the left AICA territory originated from the left VA distal to the origin of the left posterior inferior cerebellar artery.
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