Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable chest radiograph obscured by trauma board demonstrates low lung volumes . Cardiac silhouette appears enlarged though this may reflect expiratory phase scanning . Diffuse bilateral lung opacifications likely reflect technique and low lung volumes . No definite pleural effusion or pneumothorax is evident on this limited study .
    OUTPUT:
    
Expiratory phase scan with limited evaluation of cardiac silhouette and lungs . If concerned for cardiopulmonary process , repeat chest x-ray .