Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . The right hemidiaphragm HAS BEEN ELEVATED SINCE AT LEAST ___ . The heart size is enlarged . There is mild central pulmonary vascular prominence . No definite focal consolidation is identified . The nodular opacity near the right hilum is stable since the prior examinations . Re - demonstrated are mediastinal clips and midline sternal wires , which are intact and well aligned . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Central pulmonary vascular prominence without definite edema .