[Ileal endometriosis and Crohn's disease. A difficult differential diagnosis].

Endometriosis is an endometrial tissue proliferation that occurs in any extrauterine site and is usually confined to the pelvis. When the terminal ileum is affected, this entity can simulate Crohn's disease both clinically and radiologically. We describe 2 patients previously diagnosed with Crohn's disease with inadequate response to treatment, who showed intestinal obstruction located in the ileum.