Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: ET tube and enteric tube are present in standard positions . There is no pleural effusion or pneumothorax . Cardiomediastinal and hilar contours are normal . Slight enlargement of pulmonary vasculature is seen . Overall the lung opacities do look improved , however there is persistent opacification of the left mid lung zone . While this may represent pulmonary edema , its asymmetry is unusual , unless a gravitational / positional component is responsible . As the right lung is clear , ARDS is excluded as a diagnosis .
    OUTPUT:
    
1 . Persistent left mid lung zone opacity most consistent with aspiration pneumonia . Asymmetric pulmonary edema is still possible . 2 . ARDS excluded as the right lung is clear .