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Multiple FLAIR hyperintensities are seen throughout the supratentorial brain, confluent around the lateral ventricles. The SWI sequence shows innumerable punctate foci of previous haemorrhage in both the supra- and infratentorial brain, more pronounced in the basal ganglia and pons.
No abnormal diffusion restriction is seen. Atrophy of the brainstem and cerebellar hemispheres is more pronounced than that affecting the supratentorial brain; there is a "hot cross bun sign". MR Perfusion suggests generalised decreased cerebral blood flow, with possibly only relative sparing of the right peri-Sylvian region.
1. Features of multiple system atrophy
2. Multiple cerebral microhaemorrhage are predominantly in the basal ganglia and pons, and thus more likely related to hypertension rather than amyloid angiopathy.