The authors report a case of duodenal duplication in a adult. This lesion i
s rare. The clinical course is dominated by a risk of cancer. These lesions
should be recognized to avoid a mutilating excision procedure in favour of
a conservative procedure. The originality of this case is the laparoscopic
approach which confirmed the diagnosis by the elective implantation on the
first part of the duodenum. This approach, by mobilisation of the duodenum
, allows excision by a very short laparotomy.