Pneumothorax in supine projection

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A pneumothorax does not display classical signs when a patient is positioned supine for a chest radiograph. Instead, the pneumothorax may be demonstrated by looking for the following signs:

relative lucency of the involved hemithorax
deep, sometimes tongue-like, costophrenic sulcus: deep sulcus sign ²
increased sharpness of the adjacent mediastinal margin and diaphragm
increased sharpness of the cardiac borders
~~visualization~~visualisation of the anterior costophrenic sulcus: double diaphragm sign ³
~~visualization~~visualisation of the inferior edge of the collapsed lung above the diaphragm
depression of the ipsilateral hemidiaphragm

~~-<li>visualization of the anterior costophrenic sulcus: <a href="/articles/double-diaphragm-sign">double diaphragm sign</a> <sup>3</sup>~~
+<li>visualisation of the anterior costophrenic sulcus: <a href="/articles/double-diaphragm-sign">double diaphragm sign</a> <sup>3</sup>
~~-<li>visualization of the inferior edge of the collapsed lung above the diaphragm</li>~~
+<li>visualisation of the inferior edge of the collapsed lung above the diaphragm</li>

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Pneumothorax in supine projection

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