Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral views of the chest provided . Midline sternotomy wires and mediastinal clips again noted . Lung volumes are somewhat low . There is mild scarring abutting the left heart border at the site of chronic rib deformities . No signs of pneumonia . The hila appear slightly congested without frank edema . The cardiomediastinal silhouette is unchanged . No large effusion or pneumothorax . Bony structures are intact . No free air below the right hemidiaphragm .
    OUTPUT:
    
Mild hilar congestion .