Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest film ___ at 09 :39 is submitted .
    OUTPUT:
    
A pigtail catheter is again seen overlying the right upper quadrant . Lung volumes are somewhat diminished and there is increasing opacity in the retrocardiac region with a suggestion of air bronchograms which either reflects partial lower lobe atelectasis or could be consistent with a developing pneumonia . Clinical correlation is advised . There is crowding of the pulmonary vasculature but no evidence of pulmonary edema . There is likely a small layering left effusion . No pneumothorax is seen . Overall cardiac and mediastinal contours are likely stable given differences in positioning .