Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Cardiomegaly and mild central vascular pulmonary congestion is again noted . Persistent left retrocardiac opacity has slightly improved and no longer silhouettes the left hemidiaphragm . There is no large pleural effusion or pneumothorax identified . Median sternotomy wires are well aligned . The cardiomediastinal silhouette is within normal limits . Possible fibrous dysplasia is noted within the proximal left humerus , unchanged from prior examination .
    OUTPUT:
    
Relatively unchanged appearance of cardiomegaly , mild central vascular congestion , and minimally improved left retrocardiac airspace opacity .