Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes remain low , but there is no focal consolidation . Mild cardiomegaly and central vascular congestion are unchanged . Changes of median sternotomy , mediastinal clips , and pulmonary artery stent . The aorta is tortuous and calcified . There are no pleural effusions or pneumothorax .
    OUTPUT:
    
Stable mild cardiomegaly and central vascular congestion .