Abstract
This is the first recorded case of an immature cervical teratoma arising in one fetus of a twin pregnancy. Although real-time ultrasound detected the presence of an abnormality, its true nature was not established until after histological examination. Extra-amniotic prostaglandin pregnancy termination was performed at 20 weeks' gestation due to the onset of acute hydramnios and the rapid increase in tumor size. Delivery of both fetuses was performed under general anesthesia. Extraction of the abnormal twin was only possible after the tumor was separated off from the fetal neck in utero.
Key Words: