[Forrest 1b duodenal hemorrhage in previously undiagnosed primary hyperparathyroidism].

We report on a female patient who was suffering from a duodenal ulcer with an oozing haemorrhage. It turned out to be the result of an adenoma of the parathyroid combined with the clinical picture of an 'osteodystrophia fibrosa cystica generalisata', which is rarely seen. The therapy consisted in a parathyroidectomy.