Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left - sided AICD device is noted with lead terminating in the right ventricle . Heart size remains mildly enlarged . Aortic knob is calcified . Mediastinal contours are unchanged . Lung volumes are low . There is mild cephalization of the pulmonary vasculature , likely suggestive of mild chronic pulmonary congestion , but no overt pulmonary edema is seen . Several clips are again demonstrated within the anterior mediastinum . Patchy opacities in the lung bases likely reflect atelectasis though infection is not excluded in the correct clinical setting . There is no pleural effusion or pneumothorax . Pleural thickening at the right lateral base appears unchanged . Mild elevation the right hemidiaphragm is chronic .
    OUTPUT:
    
Patchy opacities in the lung bases likely reflect atelectasis though infection is not excluded in the correct clinical setting .