C sign - talocalcaneal coalition
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The C sign is an important radiological sign which may be seen on a lateral radiograph of ankle in those with a tarsal coalition (talocalcaneal coalition).
Radiographic appearance
A continuous C shaped-shaped arc is seen on a lateral ankle radiograph radiograph which is formed by the medial outline of the talar dome and posteroinferior aspect of the sustentaculum tali.
Differential diagnosis
Possible differential considerations include:
- subtalar syndesmosis or synchondrosis: CT is helpful in differentiating
- positional artefact
-<p>The <strong>C sign</strong> is an important radiological sign which may be seen on a lateral radiograph of ankle in those with a tarsal coalition (<a href="/articles/talocalcaneal-coalition">talocalcaneal coalition</a>). </p><h4>Radiographic appearance</h4><p>A continuous C shaped arc is seen on a lateral ankle radiograph which is formed by the medial outline of the talar dome and posteroinferior aspect of the sustentaculum tali.</p><h4>Differential diagnosis</h4><p>Possible differential considerations include</p><ul>- +<p>The <strong>C sign</strong> is an important radiological sign which may be seen on a lateral radiograph of ankle in those with a tarsal coalition (<a href="/articles/talocalcaneal-coalition">talocalcaneal coalition</a>). </p><h4>Radiographic appearance</h4><p>A continuous C-shaped arc is seen on a lateral ankle radiograph which is formed by the medial outline of the talar dome and posteroinferior aspect of the sustentaculum tali.</p><h4>Differential diagnosis</h4><p>Possible differential considerations include:</p><ul>
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