Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac monitoring device projects over the left lower chest . Numerous old rib fractures on the left are present with callus formation . A left upper lobe opacity has markedly improved . Left hemidiaphragm elevation persists but the large effusion and atelectasis on the present study is nearly completely resolved . The aorta remains tortuous . No pneumothorax is present .
    OUTPUT:
    
Resolution of left pleural effusion . Old left rib fractures . No acute findings .