Subdiaphragmatic free gas

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Subdiaphragmatic free gas is one of the ways of detecting presence of free intraperitoneal air. It is the presence of free, extraluminal air in the anterior subhepatic space.

Radiographic features

Presence of air in the subdiaphragamtic space. It is well appreciated as the air under diaphragm and air in lungs outline the diaphragmatic contour well.

As little as 1 ml of free air can be detected ; however the patient may be needed to be kept in upright position for about 10 minutes for the air to rise up.

Chest x- ray covering the lower thorax is considered best for the same.~~Abdominal~~ Abdominal x ray also shows the same optimally.

Differential diagnosis

~~Chiladitis~~Chilaiditi syndrome
subdiaphragmatic abscess
omental fat interpositioned between the liver and diaphragm
subpulmonary pneumoperitoneum

-<p><strong>Subdiaphragmatic free gas</strong> is one of the ways of detecting presence of free intraperitoneal air. It is the presence of free, extraluminal air in the anterior subhepatic space. </p><h4>Radiographic features</h4><p>Presence of air in the subdiaphragamtic space. It is well appreciated as the air under diaphragm and air in lungs outline the diaphragmatic contour well.</p><p>As little as 1 ml of free air can be detected ; however the patient may be needed to be kept in upright position for about 10 minutes for the air to rise up.</p><p>Chest x- ray covering the lower thorax is considered best for the same. <span style="line-height:1.6em">Abdominal x ray also shows the same optimally.</span></p><h4>Differential diagnosis</h4><ul>
~~-<li>Chiladitis syndrome</li>~~
+<p><strong>Subdiaphragmatic free gas</strong> is one of the ways of detecting presence of free intraperitoneal air. It is the presence of free, extraluminal air in the anterior subhepatic space. </p><h4>Radiographic features</h4><p>Presence of air in the subdiaphragamtic space. It is well appreciated as the air under diaphragm and air in lungs outline the diaphragmatic contour well.</p><p>As little as 1 ml of free air can be detected ; however the patient may be needed to be kept in upright position for about 10 minutes for the air to rise up.</p><p>Chest x- ray covering the lower thorax is considered best for the same. Abdominal x ray also shows the same optimally.</p><h4>Differential diagnosis</h4><ul>
+<li><a href="/articles/chilaiditi-syndrome">Chilaiditi syndrome</a></li>
~~-</ul>~~
+</ul><h4>See also</h4><ul>
+<li><a title="Pneumoperitoneum" href="/articles/pneumoperitoneum">pneumoperitoneum </a></li>
+<li><a href="/articles/pseudopneumoperitoneum">pseudopneumoperitoneum</a></li>
+</ul><p> </p>

References changed:

1. Radiological Differential Diagnosis. Jaypee Brothers Medical Publishers. (2005) ISBN:8180615006. <a href="http://books.google.com/books?vid=ISBN8180615006">Read it at Google Books</a> - <a href="http://www.amazon.com/gp/product/8180615006">Find it at Amazon</a><span class="auto"></span>
2. SCHENCK S. COLLECTION OF AIR IN THE RIGHT SUBDIAPHRAGMATIC SPACE: WITH SPECIAL REFERENCE TO HEPATODIAPHRAGMATIC INTERPOSITION OF THE COLON. Arch Surg. 01;36 (5): 766-777. <a href="http://dx.doi.org/10.1001/archsurg.1938.01190230045004">doi:10.1001/archsurg.1938.01190230045004</a><span class="auto"></span>

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