What Does The Presence Of Hazy Densities In The Upper Lung Fields And A Shifted Trachea And Mediastinum To The Left Indicate?

Hazy densities are seen in the upper lung fields. The trachea and mediastinum to the Left. The rest of the hemi diaphragm and Costco phrenic sulci are intact. The rest of the osseous and soft tissue structures are unremarkable. May I asked could someone explain This what is mean?