Bright rim sign (DNET)
Last revised by Frank Gaillard on 4 Oct 2023
Citation, DOI, disclosures and article data
Citation:
Gaillard F, Yap J, Saber M, et al. Bright rim sign (DNET). Reference article, Radiopaedia.org (Accessed on 06 Oct 2024) https://doi.org/10.53347/rID-1017
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rID:
1017
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Disclosures:
At the time the article was created Frank Gaillard had no recorded disclosures.
View Frank Gaillard's current disclosures
Last revised:
Disclosures:
At the time the article was last revised Frank Gaillard had the following disclosures:
- Biogen Australia Pty Ltd, Investigator-Initiated Research Grant for CAD software in multiple sclerosis: finished Oct 2021 (past)
These were assessed during peer review and were determined to not be relevant to the changes that were made.
View Frank Gaillard's current disclosures
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Systems:
Sections:
Synonyms:
- Bright rim sign - DNET
- Hyperintense rim sign in DNET
- Hyperintense rim sign in dysembryoplastic neuroepithelial tumours
The bright rim sign, also known as the hyperintense ring sign, is an MRI sign described most frequently in dysembryoplastic neuroepithelial tumors (DNET) but is also seen in some other tumors.
Terminology
Although the sign is most associated with DNETs, and should probably be reserved in cases where DNET is the suspected diagnosis, it is also seen in other pathologies such as myxoid glioneuronal tumors 3.
It is also visually equivalent to T2/FLAIR mismatch sign seen in some astrocytomas, IDH-mutant.
Pathology
On pathologic examination, this bright rim sign corresponds to glioneuronal elements loosely packed at the margin of the tumor surrounding an area so replete with fluid that it partially suppresses on FLAIR 1.
Radiographic features
MRI
It is described as a well-defined rim of high signal around the DNET on FLAIR sequences. This T2/FLAIR hyperintense ring, whether complete or incomplete, is fairly sensitive and specific for DNET 2. On postoperative imaging, this sign may be a helpful clue for residual tumor or tumor recurrence 2.
Quiz questions
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References
- 1. Raz E, Kapilamoorthy TR, Gupta AK et-al. Case 186: Dysembrioplastic neuroepithelial tumor. (2012) Radiology. 265 (1): 317-20. doi:10.1148/radiol.12100118 - Pubmed
- 2. Parmar HA, Hawkins C, Ozelame R et-al. Fluid-attenuated inversion recovery ring sign as a marker of dysembryoplastic neuroepithelial tumors. (2007) Journal of computer assisted tomography. 31 (3): 348-53. doi:10.1097/01.rct.0000243453.33610.9d - Pubmed
- 3. Narvaez E, Inada B, de Almeida P et al. Myxoid Glioneuronal Tumour - Report of Three Cases of a New Tumour in a Typical Location and Review of Literature. BJR Case Rep. 2021;7(4):20200139. doi:10.1259/bjrcr.20200139 - Pubmed
Incoming Links
Articles:
Cases:
- Dysembryoplastic neuroepithelial tumour (DNET) associated with dysgenesis of the corpus callosum
- Dysembryoplastic neuroepithelial tumor
- Myxoid glioneuronal tumor
- Dysembryoplastic neuroepithelial tumour (DNET)
- Dysembryoplastic neuroepithelial tumour (DNET)
- Dysembryoplastic neuroepithelial tumour (DNET)
- DNET
- Dysembryoplastic neuroepithelial tumours (DNET)
- Dysembryoplastic neuroepithelial tumour (DNET)
- Dysembryoplastic neuroepithelial tumour
- Dysembryoplastic neuroepithelial tumor
- Dysembryoplastic neuroepithelial tumour (DNET)
- Dysembryoplastic neuroepithelial tumour (DNET)
- Dysembryoplastic neuroepithelial tumour
- Dysembryoplastic neuroepithelial tumour
- Dysembroplastic neuroectodermal tumours (DNET's): bilateral
- Dysembryoplastic neuroepithelial tumour (DNET)
- Dysembryoplastic neuroepithelial tumour
- Dysembryoplastic neuroepithelial tumour (DNET)
- Dysembryoplastic neuroepithelial tumour (DNET)
Multiple choice questions:
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