Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is moderate retrocardiac and left basilar atelectasis . A small left pleural effusion is possible . The right lung is clear . Heart size is stable . No pulmonary edema or pneumothorax . No focal consolidations are noted . Median sternotomy wires are identified .
    OUTPUT:
    
Moderate retrocardiac and left basilar atelectasis with a possible small left pleural effusion . No overt pulmonary edema or pneumonia .