Double density sign (left atrium)
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A double-density sign is seen on frontal chest radiographsradiograph in the presence of left atrial enlargement, and occurs when the right side of the left atrium pushes behind the right cardiac shadow, indenting the adjacent lung and forming its own distinct silhouette 1-3.
If large enough it can actually reach beyond the border of the right atrium; this is known as atrial escape.3. The right superior pulmonary vein can lead to a similar appearance 1.
{{youtube:https://www.youtube.com/watch?v=RSVzqcXKyRw}}
See also
-<p>A <strong>double-density sign</strong> is seen on frontal chest radiographs in the presence of <a href="/articles/left-atrial-enlargement" title="Left atrial enlargement">left atrial enlargement</a>, and occurs when the right side of the left atrium pushes behind the right cardiac shadow, indenting the adjacent lung and forming its own distinct silhouette <sup>1-3</sup>. </p><p>If large enough it can actually reach beyond the border of the right atrium; this is known as <a href="/articles/atrial-escape" title="Atrial escape">atrial escape</a>.<sup>3</sup> The right superior pulmonary vein can lead to a similar appearance <sup>1 </sup></p><p><sup>{{youtube:https://www.youtube.com/watch?v=RSVzqcXKyRw}}</sup></p><h4>See also</h4><ul>-<li><a href="/articles/double-density-sign-of-osteoid-osteomas" title="double density sign of osteoid osteomas">double density sign of osteoid osteomas</a></li>-<li><a href="/articles/double-density-sign-of-berry-aneurysms" title="double density sign of berry aneurysms">double density sign of berry aneurysms</a></li>- +<p>A <strong>double-density sign</strong> is seen on frontal chest radiograph in the presence of <a href="/articles/left-atrial-enlargement">left atrial enlargement</a>, and occurs when the right side of the left atrium pushes behind the right cardiac shadow, indenting the adjacent lung and forming its own distinct silhouette <sup>1-3</sup>. </p><p>If large enough it can actually reach beyond the border of the right atrium; this is known as <a href="/articles/atrial-escape">atrial escape</a> <sup>3</sup>. The right superior pulmonary vein can lead to a similar appearance <sup>1</sup>. </p><p><sup>{{youtube:https://www.youtube.com/watch?v=RSVzqcXKyRw}}</sup></p><h4>See also</h4><ul>
- +<li><a href="/articles/double-density-sign-of-osteoid-osteomas">double density sign of osteoid osteomas</a></li>
- +<li><a href="/articles/double-density-sign-of-berry-aneurysms">double density sign of berry aneurysms</a></li>
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