The authors present their experience in the study and treatment of 18 patients with pancreatic pseudocysts. Fifteen patients were operated on as follows: 6 external drainage 4 cyst-gastrostomy, 4 cystoyeyunostomy and one had distal pancreatectomy. Nine of the patients who were operated did well and 6 died in the postoperative course; one died after a prolonged period of time.