Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiographs . Median sternotomy wires are intact . Retrocardiac atelectasis is similar to priors . Pleural effusion on the left is minimal . The right lung is clear . There is no pneumothorax . Tortuosity of the descending aorta is partially related to prior dissection .
    OUTPUT:
    
Chronic retrocardiac atelectasis .