Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A left subclavian catheter is unchanged in position . There has been interval removal of an endotracheal tube and nasogastric tube . Multiple surgical clips are again noted overlying the right lateral clavicular region . There are persistent patchy opacities at the left lung base which most likely represent mild retrocardiac atelectasis in the setting of low lung volumes . No focal consolidation , pleural effusion , or pneumothorax is appreciated in the lungs . The patient is status post median sternotomy with valve replacement . Median sternotomy wires appear intact . The cardiac silhouette remains enlarged but unchanged in appearance from the prior study .
    OUTPUT:
    
Unchanged postoperative appearance from ___ .