Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are low . The patient is status post sternotomy . The cardiac , mediastinal and hilar contours are probably unchanged , although cardiac contours are not well delineated due to low lung volumes . There are patchy basilar opacities , greater on the left than right , which obscure the left hemidiaphragm . There is also mild perihilar fullness and opacification .
    OUTPUT:
    
Findings suggesting mild pulmonary vascular congestion . Bibasilar opacities are nonspecific , particularly in the setting of low lung volumes . Atelectasis may explain the findings but other etiologies including pneumonia can not be excluded . Short - term followup radiographs may be helpful to delineate further , particularly if symptoms were to persist .