Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest demonstrate mild enlargement of the cardiac silhouette . A small right and trace left pleural effusion are slightly decreased from the prior study . Mild pulmonary vascular congestion without overt edema . Prosthetic aortic valve in unchanged position . New pneumothorax or focal consolidation .
    OUTPUT:
    
Slight improvement in previous pulmonary edema with decrease in size of right pleural effusion . No acute process .