[Secondary aorto-duodenal fistulas as a cause of massive gastrointestinal hemorrhages].

Aorto-duodenal fistulas represent a rare but highly dangerous complication following reconstructive aortic interventions. They may be the source of severe gastrointestinal hemorrhages. The recognition of cause and localization of the latter may be difficult. Only an immediate diagnosis permits urgent surgical intervention and may prevent the otherwise fatal outcome. The importance of an early diagnosis is underlined by two case reports.