Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Re-identified are multiple median sternotomy wires and mediastinal surgical clips . A tortuous thoracic aorta is re-identified . The cardiomediastinal silhouettes are stable , and otherwise within normal limits . The bilateral hila are unremarkable . There may be minimal pulmonary vascular congestion without frank pulmonary edema . Equivocal opacity at the right lung base may represent pneumonia in the appropriate clinical setting . Otherwise , no evidence of focal consolidation elsewhere . Aortic valve replacement is noted . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
1 . Low lung volumes . Mild asymmetric opacity at the right lung base is nonspecific , could represent developing infection in the appropriate clinical setting . 2 . Mild pulmonary vascular congestion without frank pulmonary edema .