Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are low , with asymmetric volume loss in the right lung from a prior right upper lobe resection . Surgical changes are stable in appearance . Diffuse interstitial opacities are compatible with chronic interstitial lung disease , though there are increased interstitial opacities throughout both lungs . In comparison to the prior radiograph , there is a new opacity in the retrocardiac region , concerning for infection . There is no obvious pulmonary edema , pleural effusion , or pneumothorax . The cardiomediastinal silhouette is normal .
    OUTPUT:
    
1 . New retrocardiac opacity , concerning for infection . 2 . Worsening interstitial opacities may represent a superimposed edema , atypical infection , or possibly , acute worsening of the underlying fibrosis .