Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest . The median sternotomy wires and mediastinal clips are stable . Low lung volumes crowd the pulmonary vasculature . There is no focal consolidation , pleural effusion or pneumothorax identified . There is mild cardiomegaly . There are aortic knob calcifications . The mediastinal and hilar contours are normal .
    OUTPUT:
    
Mild cardiomegaly . No acute cardiopulmonary process . Low lung volumes .