Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Study is limited by patient rotation and low lung volumes . Cardiac silhouette size remains moderately enlarged . Dense atherosclerotic calcifications are noted at the aortic knob . Mediastinal contours appear grossly unchanged . There is new mild to moderate pulmonary edema with perihilar haziness and vascular indistinctness . Retrocardiac opacification could reflect atelectasis combined with a small left pleural effusion , though pneumonia is not excluded in the correct clinical setting . Patchy opacity within the right lung base may also reflect an additional area of atelectasis .
    OUTPUT:
    
Limited study due to low lung volumes and patient rotation . Interval development of mild to moderate pulmonary edema . Bibasilar patchy atelectasis with possible small left pleural effusion , though infection is not excluded .