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Non-contrast CT image of the brain of an elderly patient shows a false-positive left hyperdense middle cerebral artery (MCA) sign (arrow). Subsequent MR imaging of the brain demonstrated no stroke in this patient (not shown). The patient has generalised increased density of the intracranial arteries, but as the bilateral MCAs are not imaged in the same plane, this gives a false impression of hyperdense appearance of left MCA as a result of partial volume averaging artefact.
