Proto, A V <br/><br/>
Apical opacity: a normal finding on posteroanterior chest radiographs.  [electronic resource] 

 -  Radiology  Nov 1986 
 - 429-32 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>0033-8419 
<br/><br/><label>Standard No.: </label>10.1148/radiology.161.2.3763914  doi 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Adult<br/>Aged<br/>Female<br/>Humans<br/>Male<br/>Middle Aged<br/>Radiography, Thoracic<br/>Subclavian Artery--diagnostic imaging<br/>Subclavian Vein--diagnostic imaging