Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral chest radiograph is compared radiograph dated ___ . No focal opacity convincing were pneumonias identified . Flattening of the diaphragm and hyperexpansion is consistent with COPD . Previous left pleural effusion has resolved . Patient is status post valve replacement . The heart is mildly enlarged . Hilar contours are within normal limits . No evidence of pulmonary edema . Sternotomy wires are intact . There is no pneumothorax . Visualized osseous structures demonstrates no acute abnormality .
    OUTPUT:
    
No evidence of pneumonia or pulmonary edema . Resolution of prior moderate size left pleural effusion .