Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Supine portable chest radiograph demonstrate no definite pneumothorax or pneumomediastinum . Patient is status post take as identified in the left upper quadrant of the abdomen . Tracheostomy is midline . Re - demonstration of extensive left opacity . Unchanged moderate cardiomegaly . No evidence of pulmonary edema . Right lower lung improved aeration .
    OUTPUT:
    
No pneumothorax or pneumomediastinum .