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 tumours (DNET). It is described as a well defined-defined rim of high signal around the DNET on FLAIR sequences. This T2/FLAIR hyperintense ring, whether complete or in completeincomplete, is fairly sensitive and specific for DNET 2. On post-operativepostoperative 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.
This sign can, however, be very difficult to distiguishdistinguish from the T2-FLAIR mismatch sign seen in higher-grade astrocytomas.
-<![endif]--><!--StartFragment--></p><p>The <strong>bright rim sign</strong>, also known as the <strong>hyperintense ring sign</strong>, has been described in <a href="/articles/dysembryoplastic-neuroepithelial-tumour">dysembryoplastic neuroepithelial tumours (DNET)</a>. It is described as a well defined rim of high signal around the DNET on <a href="/articles/fluid-attenuation-inversion-recovery">FLAIR</a> sequences. This T2/FLAIR hyperintense ring, whether complete or in complete, is fairly sensitive and specific for DNET <sup>2</sup>. On post-operative imaging, this sign may be a helpful clue for residual tumor or tumor recurrence <sup>2</sup>. </p><p>On pathologic examination, this bright rim sign corresponds to glioneural elements loosely packed at the margin of the tumor <sup>1 </sup>.</p><p>This sign can however be very difficult to distiguish from the <a title="T2-FLAIR mismatch sign" href="/articles/t2-flair-mismatch-sign">T2-FLAIR mismatch sign</a> seen in higher-grade astrocytomas.</p><p><!--EndFragment--></p>- +<![endif]--><!--StartFragment--></p><p>The <strong>bright rim sign</strong>, also known as the <strong>hyperintense ring sign</strong>, has been described in <a href="/articles/dysembryoplastic-neuroepithelial-tumour">dysembryoplastic neuroepithelial tumours (DNET)</a>. It is described as a well-defined rim of high signal around the DNET on <a href="/articles/fluid-attenuation-inversion-recovery">FLAIR</a> sequences. This T2/FLAIR hyperintense ring, whether complete or incomplete, is fairly sensitive and specific for DNET <sup>2</sup>. On postoperative imaging, this sign may be a helpful clue for residual tumor or tumor recurrence <sup>2</sup>. </p><p>On pathologic examination, this bright rim sign corresponds to glioneural elements loosely packed at the margin of the tumor <sup>1</sup>.</p><p>This sign can, however, be very difficult to distinguish from the <a href="/articles/t2-flair-mismatch-sign">T2-FLAIR mismatch sign</a> seen in higher-grade astrocytomas.</p><p><!--EndFragment--></p>
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