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. It can be seen in both osseous and nonosseous non-osseous 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 due to their bridging.
Differential diagnosis
Considerations include:
- subtalar syndesmosis or synchondrosis: CT is helpful in differentiating
- positional artifact
-<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>. It can be seen in both osseous and nonosseous coalition.</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 due to their bridging.</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 <a title="Ankle (lateral view)" href="/articles/ankle-lateral-view-2">lateral radiograph of the ankle</a> in those with the <a href="/articles/talocalcaneal-coalition">talocalcaneal subtype</a> of <a href="/articles/tarsal-coalition">tarsal coalition</a>. It can be seen in both osseous and non-osseous <a title="Coalition" href="/articles/coalition">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 due to their bridging.</p><h4>Differential diagnosis</h4><p>Considerations include:</p><ul>
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