Bright rim sign (DNET)
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The bright rim sign, also known as the hyperintense ring sign, has been described in dysembryoplastic neuroepithelial tumors (DNET). 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.
On pathologic examination, this bright rim sign corresponds to glioneural elements loosely packed at the margin of the tumor 1.
- 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