Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well inflated . A heterogeneous left lower lobe opacity is noted . Mildly decreased chronic right pleural effusion with associated right lower lobe atelectasis . No left pleural effusion . No pneumothorax . Heart is moderately enlarged and stable from previous examination . Mediastinal contour and hila are otherwise unremarkable .
    OUTPUT:
    
1 . Heterogeneous left lower lobe opacity worrisome for atypical pneumonia . Differential includes asymmetric edema . 2 . Mildly decreased chronic right pleural effusion with right lower lobe atelectasis . 3 . Emphysema / COPD .