Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient has been extubated and an orogastric tube removed since the prior radiographs . The cardiac , mediastinal and hilar contours appear stable including mild cardiac enlargement . The lung volumes are low . There is no pleural effusion or pneumothorax . Diffuse streaky residual retrocardiac opacities are identifiable but markedly improved .
    OUTPUT:
    
Improving retrocardiac opacification .