Esophagogram demonstrated the “mass” is a giant esophageal diverticulum filled with food debris, no evidence of contrast medium leakage, and showed the distal esophagus was unobstructed without contrast agent stasis, and the mucosa and structure at the gastroesophageal junction were normal. Two nasogastric tubes were inserted (one was inserted into the esophagus for suction residual chymus, the other was inserted into the stomach for supplying nutrition).