[Double pylorus through antrobulbar fistula formation (author's transl)].

Three patients are presented with double pylori due to antrobulbary fistulas after penetration of ulcers through the prepyloric mucosa or the pyloric ring. Two cases were diagnosed radiographically; in one of them the diagnosis was confirmed by gastroscopy and verified by subsequent operation. The third case was revealed at autopsy. The etiology and pathogenesis of fistulas within the gastrointestinal tract are discussed with regard to the current literature.