Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low , contributing to vascular crowding . Despite that , there is likely mild pulmonary vascular congestion . Sternotomy wires are intact and aligned . Moderate cardiomegaly despite the projection is unchanged . Small left pleural effusion has slightly increased . Increased retrocardiac airspace opacification may be due to atelectasis or aspiration . There is no pneumothorax .
    OUTPUT:
    
New retrocardiac airspace opacification may be due to atelectasis or aspiration . Slightly increased small left pleural effusion .