Pancreatic pseudocyst is usually treated by percutaneous external drainage, endoscopic internal or external drainage, or surgical internal drainage such as cystogastrostomy. Surgical external drainage is an option if these procedures fail. We describe a case of a 70-year-old man with a pancreatic body pseudocyst that developed postoperatively. It was improved by endoscopic external drainage, and the stent was changed to an internal stent. However, surgery was required as the pseudocyst grew again. A direct approach to the pseudocyst was not possible because of severe adhesion. A distal pancreatectomy with pancreaticojejunostomy was performed, and an external pancreatic stent tube was inserted from the cut end into the duodenum to drain the pseudocyst. One month later, the pseudocyst disappeared, and the stent was removed.