Massive fetal cervical teratoma managed with the ex utero intrapartum treatment (EXIT) procedure.

Teratomas are rare congenital tumors typically comprising all 3 germ cell layers. Cervical teratomas arise in the neck and represent a minority of all teratomas. These are associated with high morbidity and mortality because of their propensity to cause airway obstruction. Demonstration on prenatal magnetic resonance imaging is uncommon, especially for a tumor of this size. Fetuses diagnosed with large neck masses are managed through cesarean section with the ex utero intrapartum treatment procedure to secure the airway, such as in our case of a large cervical teratoma in the female fetus of a 30-year-old mother who went into preterm labor.