Haemosiderin cap sign

The haemosiderin cap sign refers to an MR imaging feature in some spinal tumours where a cap of T2 hypointense haemosiderin is above and/or below the tumour due to previous haemorrhage. 

It is most often associated with spinal cord ependymomas, being seen in 20-33% of these cases 1. The sign however may also be seen in hemangioblastomas and paragangliomas and therefore it is suggestive of but not pathognomonic for ependymoma

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