The pulmonary artery lies in a normal position in front of the trachea, but it is anchored to the distal part of the aortic arch by a patent ductus arteriosus —or a ligamentum arteriosum — at ...
After entering the upper trachea, the bronchoscope is turned back ... Telescopes may be inserted into the rigid bronchoscope to visualize the distal segments, requiring the angled 30° and 90 ...
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