Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Overlying trauma board slightly limits evaluation . Endotracheal tube terminates approximately 6 .5 cm from the carina , and nasogastric tube tip courses through the stomach , off the inferior borders of the film . There are low lung volumes . The heart size is mildly enlarged . Apparent widening of the superior mediastinum may be due to supine technique and low lung volumes . Ill - defined opacities within the left upper and both lower lung fields may atelectasis . No large pneumothorax is seen . There may be a trace left pleural effusion . There is mild irregularity of the right seventh rib laterally , and fracture in this region is not excluded .
    OUTPUT:
    
1 . Standard positioning of lines and tubes . 2 . Low lung volumes with left upper lung and bibasilar opacification , possibly representing atelectasis . Possible small left pleural effusion . 3 . Superior mediastinal widening may be due to low lung volumes and supine positioning though a chest CTA can be performed for further evaluation if there is concern for mediastinal injury . 4 . Irregularity of the right seventh rib laterally and a fracture in this region is not excluded .