A case of cystic lymphangioma of stomach and jejunum is reported. The patient, a woman aged 58, was referred to the hospital for a melena of 4 days duration, which was interpreted as related to an old history of hypertrophic gastritis and duodenal ulcer. A conservative treatment with transfusions, cimetidine i.v., and gastric washout with antacids was started, but the hemorrhage appeared unresponsive, so an explorative laparotomy was performed. At the operation a soft pliable cystic mass in the anterior wall of the stomach was found; a smaller one was felt in the second jejunal loop. A Billroth II gastroduodenal resection was performed. The diagnosis of nature was only microscopic. At 9 months follow-up the patient is well, free of the disease.