The <a href="https://en.wikipedia.org/wiki/Aortopulmonary_window_(space)" class="extiw" title="en:Aortopulmonary window (space)">aortopulmonary angle</a> seen on a normal <a href="https://en.wikipedia.org/wiki/chest_radiography" class="extiw" title="en:chest radiography">chest radiograph</a>. <br>Reference:
<ul><li><cite style="font-style:normal"> (2004). "Aortopulmonary Window or Angle on the Chest Radiograph?". <i>American Journal of Roentgenology</i> <b>182</b> (4): 1085–1086. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" class="extiw" title="w:Digital object identifier">DOI</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.2214/ajr.182.4.1821085">10.2214/ajr.182.4.1821085</a>. <a href="https://en.wikipedia.org/wiki/International_Standard_Serial_Number" class="extiw" title="en:International Standard Serial Number">ISSN</a> <a rel="nofollow" class="external text" href="https://www.worldcat.org/issn/0361-803X">0361-803X</a>.</cite></li></ul>
<a href="//commons.wikimedia.org/wiki/User:Mikael_H%C3%A4ggstr%C3%B6m" title="User:Mikael Häggström">Mikael Häggström</a>
2017-08-21
<p><span class="int-own-work" lang="en">Own work</span>
</p>
<br clear="all"><div class="thumb tleft"><div class="thumbinner" style="width:222px;"><a href="//commons.wikimedia.org/wiki/File:Normal_posteroanterior_(PA)_chest_radiograph_(X-ray).jpg" class="image"><img src="https://upload.wikimedia.org/wikipedia/commons/thumb/a/a1/Normal_posteroanterior_%28PA%29_chest_radiograph_%28X-ray%29.jpg/220px-Normal_posteroanterior_%28PA%29_chest_radiograph_%28X-ray%29.jpg" decoding="async" width="220" height="252" class="thumbimage" srcset="https://upload.wikimedia.org/wikipedia/commons/thumb/a/a1/Normal_posteroanterior_%28PA%29_chest_radiograph_%28X-ray%29.jpg/330px-Normal_posteroanterior_%28PA%29_chest_radiograph_%28X-ray%29.jpg 1.5x, https://upload.wikimedia.org/wikipedia/commons/thumb/a/a1/Normal_posteroanterior_%28PA%29_chest_radiograph_%28X-ray%29.jpg/440px-Normal_posteroanterior_%28PA%29_chest_radiograph_%28X-ray%29.jpg 2x" data-file-width="1929" data-file-height="2207"></a>  <div class="thumbcaption"><div class="magnify"><a href="//commons.wikimedia.org/wiki/File:Normal_posteroanterior_(PA)_chest_radiograph_(X-ray).jpg" class="internal" title="Enlarge"></a></div>Original chest radiograph.</div></div></div>