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 the ankle in those with the talocalcaneal subtype of tarsal coalition.
Radiographic appearance
A continuous C-shaped arc on a lateral ankle radiograph is formed by the medial outline of the talar dome and posteroinferior aspect of the sustentaculum tali.
Differential diagnosis
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 the ankle in those with the <a title="Talocalcaneal coalition" href="/articles/talocalcaneal-coalition">talocalcaneal subtype</a> of <a title="Tarsal coalition" href="/articles/tarsal-coalition">tarsal coalition</a>. </p><h4>Radiographic appearance</h4><p>A continuous C-shaped arc on a lateral ankle radiograph is formed by the medial outline of the talar dome and posteroinferior aspect of the sustentaculum tali.</p><h4>Differential diagnosis</h4><p>Considerations include:</p><ul>- +<p>The <strong>C sign</strong> is an important radiological sign which may be seen on a lateral radiograph of the ankle in those with the <a href="/articles/talocalcaneal-coalition">talocalcaneal subtype</a> of <a href="/articles/tarsal-coalition">tarsal coalition</a>. </p><h4>Radiographic appearance</h4><p>A continuous C-shaped arc on a lateral ankle radiograph is formed by the medial outline of the talar dome and posteroinferior aspect of the sustentaculum tali.</p><h4>Differential diagnosis</h4><p>Considerations include:</p><ul>
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