Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is ill - defined opacity which partially obscures the left hemidiaphragm as compared to the right and there is some opacification of the lower thorax on the lateral view . No pleural effusion , pulmonary edema or pneumothorax is present . There is mild cardiomegaly . The patient is status post median sternotomy and CABG . Incidental note is made of congenital bridging of the left anterior fourth and fifth ribs .
    OUTPUT:
    
Subtle opacity at left base could indicate an early or developing pneumonia . Follow up CXR may be helpful in this regard . Findings discussed by Dr . ___ by telephone with Dr . ___ .