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(a) Non-contrast CT image of the brain shows a right hyperdense posterior inferior cerebral artery (PICA; arrow) in a patient who presented with cerebellar stroke. (b) Diffusion-weighted MR image of the brain shows restricted diffusion in the right PICA territory of the cerebellum (arrow). (c) Time-of-flight MR angiogram shows no flow signal in the right PICA (arrow). Good flow signal is observed in the normal contralateral left PICA.
