Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate low lung volumes . There is no focal consolidation , pleural effusion or pneumothorax . Lungs are essentially clear . The hilar and mediastinal silhouettes are unchanged . The descending aorta appears tortuous . There is moderate cardiomegaly . The patient is status post medial sternotomy . No pneumothorax .
    OUTPUT:
    
Low lung volumes . Moderate cardiomegaly .