Hemosiderin cap sign
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At the time the article was created Andrew Dixon had no recorded disclosures.
View Andrew Dixon's current disclosuresAt the time the article was last revised Mohammad Taghi Niknejad had no financial relationships to ineligible companies to disclose.
View Mohammad Taghi Niknejad's current disclosures- Cap sign of spinal tumour
- Hemosiderin cap sign
- Haemosiderin capping
The hemosiderin cap sign refers to an MR imaging feature in some spinal tumors where a cap of T2 hypointense hemosiderin is above and/or below the tumor due to previous hemorrhage.
It is most often suggestive, but not pathognomonic, for spinal cord ependymomas (20-33% of cases) 1,3.
It may also be seen in hemangioblastomas and paragangliomas. In addition, larger cavernous malformations of the spine may appear to lack a complete hemosiderin ring where they reach the pial surface, and thus develop a hemosiderin cap.
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References
- 1. Koeller KK, Rosenblum RS, Morrison AL. Neoplasms of the spinal cord and filum terminale: radiologic-pathologic correlation. Radiographics. 20 (6): 1721-49. Radiographics (citation) - Pubmed citation
- 2. Haaga JR, Boll D. CT and MRI of the whole body. Mosby. (2009) ISBN:0323053750. Read it at Google Books - Find it at Amazon
- 3. Andy Adam, Adrian K. Dixon, Jonathan H. Gillard et al. Grainger & Allison's Diagnostic Radiology. (2021) ISBN: 9780702075247 - Google Books
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