Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest views were obtained with patient in upright position . Comparison is made with the next preceding similar study of ___ . PA and lateral chest views with patient in upright position demonstrate mild enlargement of the cardiac silhouette without typical configurational abnormality . Unremarkable appearance of thoracic aorta . The pulmonary vasculature demonstrates an upper zone redistribution pattern , but there is no evidence of interstitial or alveolar edema . The previously identified bilateral pleural effusions have regressed markedly . There remains a mild degree of right - sided pleural effusion obliterating the lateral half of the diaphragmatic contour and filling the lateral pleural sinus . This extends into the posterior pleural sinus . On the other hand , evidence of left - sided pleural effusion has disappeared completely with clear delineation of the diaphragmatic contour and sharp delineation of both lateral and posterior pleural sinuses which indicates absence of any remaining fluid . No new acute pulmonary parenchymal infiltrates can be identified , and the apical areas do not show any pneumothorax . Skeletal structures of the thorax are quite unremarkable .
    OUTPUT:
    
Marked regression of pleural effusions with small right - sided pleural effusion remaining . Also , the enlargement of the cardiac silhouette has regressed markedly .