Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Mediastinal vascular pedicle engorgement , cardiomegaly are increased from ___ . Bibasilar opacities obscure both heart borders . No pneumothorax .
    OUTPUT:
    
Cardiomegaly with pulmonary vascular congestion . Bibasilar opacities , at least some of which is due to atelectasis . Superimposed infection is difficult to exclude .