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Key facts Synonym:Siderosis.Definition:Hemosiderin staining of leptomenginges following repeated subarachnoid hemorrhage(SAH).Classic imaging appearance:surface of brain appears to be outlined in black on T2WI.Generally causes deafness and ataxia.Imaging finding General features:Best imaging clue is black outline of brain on T2WI.CT findings:(1)Cerebral atrophy;(2)Slightly hyperdense rim over brain surface.
Key facts Synonym: Siderosis. Definition: Hemosiderin staining of leptomenginges following repeated subarachnoid hemorrhage (SAH). Classic imaging appearance: surface of brain appears to be outlined in black on T2WI. Generative causes deafness and ataxia. Imaging finding General features: Best imaging clue is black outline of brain on T2WI. CT findings: (1) Cerebral atrophy; (2) Slightly hyperdense rim over brain surface.