Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A large well - circumscribed gas distended structure in the left lower chest measures approximately ___ .6 x 6 .9 cm and likely reflects a large hiatal hernia or herniation of the stomach into the chest cavity . It s presence limits the assessment of the heart size . The mediastinum continues to show calcified atherosclerotic disease of the aortic knob , but no apparent widening was appreciated . The lungs demonstrate bibasilar atelectasis , likely from mass effect to the herniated stomach . There is no large pleural effusion or pneumothorax .
    OUTPUT:
    
Large hiatal hernia or complete gastric herniation into the chest . Entities such as gastric volvulus can not be excluded ; findings were discussed with ___ at 18 :30 on ___ by ___ . A lateral veiw may be helpful in assessing anterior - posterior positioning .