Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mediastinal contours , hilar , cardiac borders are normal . The lungs are well - expanded with vague focal opacification the left mid lung , not seen on lateral view . Mitral annular and aortic bulb calcifications are noted .
    OUTPUT:
    
1 . No evidence of CHF . 2 . Vague focal opacification in the left mid lung could represent overlapping osseous structures or pulmonary nodule .