Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Midline drain and right thoracostomy tube appear unchanged in position . Pulmonary vascular congestion is mild , and unchanged . No focal parenchymal consolidation . Small left pleural effusion is stable . No pleural effusion on the right . Oval - shaped lucency at the right lung base most likely represents pneumoperitoneum , although a small subpulmonic pneumothorax can not be excluded . Expected postoperative appearance of the cardiomediastinal silhouette .
    OUTPUT:
    
1 . No significant interval change in mild vascular congestion and small left effusion . 2 . Additional ovoid lucency at the right lung base may represent either subdiaphragmatic or subpulmonic free air .