Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post aortic valve replacement . The sternotomy wires are intact . Mediastinal clips are redemonstrated . Lung volumes are low , accounting for bronchovascular crowding . However the interstitial markings are significantly more pronounced compared with prior exams and there is upper vascular redistribution suggesting mild interstitial edema . Patchy opacities in both lower lobes , including a retrocardiac bandlike opacity better seen in the lateral view , are not significantly changed compared with prior T - spine radiograph and likely represent fibrotic changes . There is a small left - sided pleural effusion . There is no pneumothorax . Cardiac size can not be properly evaluated .
    OUTPUT:
    
Mild interstitial pulmonary edema with associated small left - sided pleural effusion . Stable fibrotic changes in both lung bases . No definite evidence of pneumonia .