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Grade III megaesophagus. A: Posteroanterior X-ray showing right inferior mediastinal widening (black arrow) and right superior mediastinal widening, the latter simulating a pneumomediastinum due to gas content inside of the esophagus (white arrow). Absence of the gastric air bubble (arrowhead). B: Lateral X-ray showing an air-fluid level (asterisk) and a retrocardiac mass (arrowheads).
