[Rare duplications of the alimentary tract (author's transl)].

Three rare cases of spherical duplication of the alimentary tract and a duplication with a pedicle associated with the ileum are reported. The treatment advocated for the duplication of the cervical oesophagus and of the ano-rectal region is the removal of the mucosa with suturing of the partially removed cyst edges. The rare intraluminous duplication of the pylorus can be removed by a duodenoantrostomy which can be performed easily in the new-born.