Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Diffuse mild interstitial opacities are slightly increased from the most recent prior study of ___ . Increased opacification of the right lung base is noted . The lung volumes remain low . No pneumothorax is detected . Blunting of the bilateral costophrenic angles is compatible with small bilateral pleural effusions . The mediastinal and hilar contours are unchanged . The aortic knob remains densely calcified . A prosthetic aortic valve is again noted and unchanged in position . The patient is status post median sternotomy with wires appearing intact . Dense mitral annular calcifications are again noted .
    OUTPUT:
    
Chronic interstitial abnormality could represent edema or fibrosis . Possible superimposed consolidation in the right lung base . Small bilateral pleural effusions .