Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Supine portable view of the chest demonstrates low lung volumes . A left internal jugular central venous catheter tip is seen projecting over confluence of brachiocephalic veins . Diffuse bilateral airspace opacities are noted , progressed since prior . Right hemidiaphragm appears elevated , unchanged . There is no pneumothorax . Heart is slightly enlarged . There is perihilar vascular congestion . Partially imaged upper abdomen is unremarkable .
    OUTPUT:
    
1 . Left internal jugular central venous catheter tip projects over confluence of brachiocephalic veins . No pneumothorax . 2 . Low lung volumes . Diffuse bilateral airspace opacities , likely pulmonary edema , however , superimposed infection can not be excluded .