Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP single view of the chest has been obtained with patient in sitting semi-upright position . Comparison is made with the frontal view of AP and lateral chest examination obtained two days earlier ( ___ ) . Again , there is status post sternotomy and the presence of multiple surgical clips in the left - sided anterior mediastinal structures is indicative of bypass surgery . The heart size has not changed significantly . The pulmonary vasculature is not congested . An apparently postoperatively developed thin plate atelectasis on the left base remains unchanged . The right hemithorax does not demonstrate any pulmonary abnormalities at all . Skeletal structures grossly unchanged and no evidence of pneumothorax .
    OUTPUT:
    
No change in chest appearance in comparison with preceding image obtained two days earlier .