Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well inflated with left lower lobe atelectasis and elevation of the left hemidiaphragm . No pneumothorax . Heart size and hila are unremarkable . Longitudinaly oriented bulbous air - filled structure along the middle mediastinum is seen delineating the right paratracheal stripe .
    OUTPUT:
    
Bulbous air-filled structure along the middle mediastinum is most consistent with a gaseous distended esophagus from achalasia .