Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiographs were obtained . Left lower lobe effusion and overlying dependent atelectasis have increased since ___ . Blunting of the right costophrenic angle is unchanged . There is no additional airspace opacity or pneumothorax . Cardiac and mediastinal contours are normal .
    OUTPUT:
    
Increasing left lower lobe effusion and overlying atelectasis may be part of post lobectomy changes in an asymptomatic patient . Superimposed infection can not be excluded in a symptomatic patient .