OBJECTIVE:To report a case of cystic cervical endometriosis that caused a massive hemorrhage due to rupture of a cyst and successful management with a loop electrosurgical excision procedure (LEEP). DESIGN:Case report. SETTING:University Hospital. PATIENT:A 37-year-old nulliparous woman. INTERVENTION(S):Medical management including surgical treatment. MAIN OUTCOME MEASURE(S):Clinical follow-up and pathologic diagnosis. RESULT(S):A hemorrhagic cystic cervical mass was excised with emergent LEEP. The mass was found to be cervical endometriosis. There was no evidence of recurrence until 1 year after excision. CONCLUSION(S):Cystic formation of cervical endometriosis--like ovarian endometrioma, which causes a massive hemorrhage due to rupture--is extremely rare, although cervical endometriosis is generally asymptomatic. Hysterectomy is considered in such cases but can be avoided via LEEP that incorporates partial excision of the uterine cervix.