Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patchy bibasilar opacities are again seen , right greater than left , most likely representing scarring in atelectasis ; difficult to entirely exclude underlying pneumonia , particularly at the right lung base , however , this is felt less likely . No large pleural effusion is seen . There is no pneumothorax . Cardiac and mediastinal silhouettes are grossly stable . The patient is status post median sternotomy . Some compression deformities are again seen in the mid to lower thoracic spine .
    OUTPUT:
    
Patchy bibasilar opacities most likely due to atelectasis / scarring semi : Difficult to entirely exclude underlying pneumonia , particularly at the right lung base , however , this is felt less likely .