Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient has history of CABG with median sternotomy wires and mediastinal clips seen . Chronic elevation of the right hemidiaphragm is unchanged . Low lung volumes bilaterally . Cardio mediastinal silhouette is unchanged . Mild pulmonary vascular congestion bilaterally unchanged or minimally improved . There is no pneumothorax or pleural effusion . No evidence of pneumonia .
    OUTPUT:
    
No evidence of pneumonia . Bilateral mild pulmonary vascular congestion unchanged or minimally improved .