Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is mild diffuse increased density of the left lung compared with the right lung , which has been an usual radiographic finding since the CABG , with different degrees of severity on subsequent exams , suggestive of asymmetric recurrent pulmonary edema of the left lung . A vague opacity in the right upper lung as well as foci of more conspicuous opacities along the inferior left cardiac margin and above the left hemidiaphragm , which margins are obscures , may represent overlapping infection / inflammation . There may be a small right - sided pleural effusion . No left - sided pleural effusion is identified . Significant biapical scarring is present . There is no pneumothorax . Cardiac size is top - normal . Sternotomy wires are intact .
    OUTPUT:
    
1 . Asymmetric diffuse interstitial opacities in the left lung is slightly improved from the previous exams but a repeated finding since CABG procedure . Differential diagnosis includes asymmetric pulmonary edema from ipsilateral venous or lymphatic obstruction . If symptoms presist a pulmonary venogram could be performed . Aspiration should also be considered although this appearance is rather atypical for this diagnosis . 2 . Vague bilateral opacities may represent superimposed infectious or inflammatory process . Correlate with clinical signs of pneumonia .