Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Again seen is a chest tube at the left lung base . On the current examination , there is an apparent small left upper lobe pneumothorax , with calcifications seen along the edge of the lung . There is a tiny left effusion , with possible small left hydro pneumothorax . The dense opacification in the left mid / lower zone is somewhat different n configuration , but overall similar in appearance . The cardiac silhouette is partially obscured by the opacity -- no definite change in the silhouette . There is calcification at the right lung apex , slight offset from the ribs . This is similar to the prior film and could reflect pleural thickening rather than pneumothorax . Hazy opacity at the right lung base laterally could reflect the opacity seen on the recent chest x-ray or alternatively could be artifact due to overlying breast tissue . Minimal blunting of the right costophrenic angle is new , is consistent with a small right pleural effusion . The right lung is otherwise grossly clear . Background parenchymal distortion is likely related to background COPD . Scattered nodular densities are suggestion both lungs , but best demonstrated on the recent CT hand .
    OUTPUT:
    
1 . Apparent small left apical pneumothorax , new compared with the prior exam . Left chest tube is similar in configuration . 2 . Extensive left mid / lower zone opacity is overall similar . 3 . New faint hazy opacity in the right base laterally may correspond to a finding on the prior CT or alternatively , could be artifact due to overlying breast tissue . 4 . Prominent background COPD / parenchymal scarring . Doubt superimposed CHF .