Accepted 28 February 1996 A 25-year-old woman presented with a history of burning in the epigastrium, delayed postprandial vomiting and a weight loss of 5 kg over six months. There was no history of any gastrointestinal bleeding, altered bowel habits, fever, anorexia, respiratory symptoms, or treatment for tuberculosis. Examination of the abdomen revealed mild epigastric tenderness but no palpa...