Endometriosis is an ectopic implantation of endometrial tissue. Authors report a case of a 33 year-old infertile women who presented a deep pelvic endometriosis infiltrating the right ureter with left ovarian endometrioma suspected by the ultrasonography and confirmed with MRI. The patient was treated with Gn-RH analogues with relief of symptoms and normalisation of the upper urinary tract.