1. 
   aortic knuckle
   The contour of the aortic arch protruding from the mediastinal silhouette in an anteroposterior (AP) radiograph of the chest. ... (05 Mar 2000) ...
   Found op http://www.mondofacto.com/facts/dictionary?aortic+knuckle
   
   
2. 
   aortic knuckle
   Type: Term Definitions: 1. the contour of the aortic arch protruding from the mediastinal silhouette in an anteroposterior (AP) radiograph of the chest.
   Found op http://www.medilexicon.com/medicaldictionary.php?t=47266
   
   

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