Sesamoid ossicles of the nuchal ligament
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Sesamoid ossicles of the nuchal ligament are a relatively common anatomical variant that are usually asymptomatic and most commonly occur at the C5/6 or C6/7 vertebral levels.
Epidemiology
They occur in ~7.5% of the population, with a male predominance of 3:1 1.
Radiographic features
Plain radiograph
- well-defined, corticated, round or oval opacity on lateral projection
CT
- cortical bone with central marrow within the nuchal ligament
Differential diagnosis
- myositis ossificans
- Clay-shoveler fracture
- calcareous bursitis
- nuchal fibrocartilaginous pseudotumor
- heterotrophy in the secondary nucleus of the C6 spinous process
- calcium hydroxyapatite deposition disease
-<p><strong>Sesamoid ossicles of the nuchal ligament</strong> are a relatively common anatomical variant that are usually asymptomatic and most commonly occur at the C5/6 or C6/7 vertebral levels. </p><h4>Epidemiology</h4><p>They occur in ~7.5% of the population, with a male predominance of 3:1 <sup>1</sup>. </p><h4>Radiographic features</h4><h5>Plain radiograph</h5><ul><li>well-defined, corticated, round or oval opacity on lateral projection</li></ul><h5>CT</h5><ul><li>cortical bone with central marrow within the nuchal ligament</li></ul>- +<p><strong>Sesamoid ossicles of the nuchal ligament</strong> are a relatively common anatomical variant that are usually asymptomatic and most commonly occur at the C5/6 or C6/7 vertebral levels. </p><h4>Epidemiology</h4><p>They occur in ~7.5% of the population, with a male predominance of 3:1 <sup>1</sup>. </p><h4>Radiographic features</h4><h5>Plain radiograph</h5><ul><li>well-defined, corticated, round or oval opacity on lateral projection</li></ul><h5>CT</h5><ul><li>cortical bone with central marrow within the <a href="/articles/ligamentum-nuchae">nuchal ligament</a>
- +</li></ul><h4>Differential diagnosis</h4><ul>
- +<li><a title="Myositis ossificans" href="/articles/myositis-ossificans-1">myositis ossificans</a></li>
- +<li><a title="Clay-shoveler fracture" href="/articles/clay-shoveler-fracture-2">Clay-shoveler fracture</a></li>
- +<li><a title="Calcific bursitis" href="/articles/calcific-bursitis">calcareous bursitis</a></li>
- +<li><a title="nuchal fibrocartilaginous pseudotumor" href="/articles/nuchal-fibrocartilaginous-pseudotumor">nuchal fibrocartilaginous pseudotumor</a></li>
- +<li>heterotrophy in the secondary nucleus of the C6 spinous process</li>
- +<li><a title="CPPD" href="/articles/calcium-pyrophosphate-dihydrate-deposition-disease-1">calcium hydroxyapatite deposition disease</a></li>
- +</ul>
References changed:
- 2. Gokce E & Beyhan M. Evaluating Ossifications of the Nuchal Ligament with Cervical Computed Tomography. Eurasian J Med. 2018;50(1):23-7. <a href="https://doi.org/10.5152/eurasianjmed.2018.17314">doi:10.5152/eurasianjmed.2018.17314</a> - <a href="https://www.ncbi.nlm.nih.gov/pubmed/29531487">Pubmed</a>
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Ossification of ligamentum nuchae
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