3 cm in diameter and deeply infiltrative disease, histology should be obtained to identify endometriosis and to exclude rare instance of malignancy .CA-125 >35 U/mL may be used as evidence of recurrence Q.Complications:Malignancy: MC type is endometroid adenocarcinoma QInfertility QUreteric obstruction & hydronephrosisTreatment of EndometriosisMedicalSurgical* NSAIDs in patients with pelvic pain, if the diagnosis of endometriosis has not been definitively (excision & biopsy) established.* Achieve an anovulatory state by hormonal contraception: Progestins (Medroxyprogesterone acetate), danazot, gestrinone, or GnRH* GnRH can be combined with estrogen & progestogen without loss of efficacy but with fewer hypoestrogenic symptoms.* Laparoscopic surgical approaches include excision of ovarian adhesions & of endometriomas Q.* Endometriomas: Excision is considered to be far superior in terms of permanent removal of the disease & pain relief* Operative laparoscopic surgery can provide pain relief & improved fertility.* Radical surgical options could include singular or bilateral oophorectomy.">