[Gastroduodenal Crohn disease. Presentation with a case report].

On the basis of a casuistics the infrequent isolated manifestation of a morbus Crohn in the duodenum is discussed. Apart from the clinical symptomatology the radiological and endoscopic proof of a segmentary stenosis is the most important diagnostic reference. The histological ascertainment of the granulomatous inflammation by aimed endoscopic biopsies is successful only at a low percentage, so that the synopsis of the findings is decisive for the diagnosis.