Twenty-nine patients with enterogastric reflux syndrome after anti-ulcer gastric surgery underwent a revisional Roux-en-Y gastrectomy. The diagnosis of enterogastric reflux syndrome was based on symptomatology and endoscopy in the first eight patients. The latter 21 patients had, in addition, a 99mTc-HIDA scintigraphy for the documentation and measurement of reflux. An enterogastric reflux index > 20 per cent is considered to justify symptoms due to reflux. Three of the first eight patients continued postoperatively to experience the same symptoms as before. These symptoms were eventually attributed to other than enterogastric reflux syndromes. The latter 21 patients were relieved from their preoperative symptoms and classified as Visick I and II (18 patients) and Visick III (3 patients). The authors conclude that enterogastric reflux syndrome must be documented on scintigraphy before the patient is subjected to revisional anti-reflux surgery in order for failures due to misdiagnosis to be avoided.