Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest demonstrate increased opacification of the left base , which likely represents atelectasis and pleural effusion , however pneumonia could be considered in the appropriate clinical setting . There is mild pulmonary edema . The cardiomediastinal and hilar contours are unchanged . There is persistent cardiomegaly . No pneumothorax . There has been interval removal of the tracheostomy and right sided internal jugular central venous line . A pacemaker device is present , with a single lead terminating in the region of the right ventricle .
    OUTPUT:
    
1 . Increased opacification of the left base likely represents atelectasis and pleural effusion , however pneumonia could be considered in the appropriate clinical setting . 2 . Mild pulmonary edema .