Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A left - sided dialysis catheter terminates in the upper atrium . The patient is status post sternotomy . The cardiac , mediastinal and hilar contours appear unchanged . There is similar moderate relative elevation of the left hemidiaphragm with patchy basilar opacification suggesting minor atelectasis . Elsewhere , the lungs appear clear . There is no definite pleural effusion or pneumothorax . A small pleural effusion would be difficult to appreciate on the left side , however , if one were present .
    OUTPUT:
    
No evidence of acute disease .