Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to chest radiographs from ___ , new opacification in the left mid and lower lung could represent aspiration or asymmetric pulmonary edema . Increasing retrocardiac opacity is most consistent with atelectasis , though aspiration can not be excluded . The heart is moderately enlarged , increased from prior . No appreciable pleural effusions . No pneumothorax . Platelike atelectasis in the right mid - to - lower lung persists .
    OUTPUT:
    
1 . Opacification in the left mid to lower lung could represent aspiration , though asymmetric pulmonary edema is possible , given new moderate cardiomegaly . 2 . Increasing retrocardiac opacity could represent atelectasis secondary to mucous plugging , though aspiration can not be definitively excluded . 3 . Persistent platelike atelectasis in the right mid to lower lung .