Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Are right internal jugular approach Swan - Ganz catheter terminates in expected position . There has been interval removal of an endotracheal tube and enteric tube . Lung volumes are somewhat low . There is a dense retrocardiac opacity which likely reflects atelectasis and perhaps a small effusion . There is minimal atelectasis at the base of the right lung . No pulmonary edema . No pneumothorax .
    OUTPUT:
    
Left basal opacity likely reflects atelectasis and a small pleural effusion . Minimal right basal atelectasis . No pneumothorax .