A 34-year-old woman gravida 5, para 3, abortion 1 presented to the ER of our hospital, at 29 weeks' gestation, due to uterine contractions that increased in frequency and intensity in the last 5 hours, with no other symptomatologies added (Figure 1). Her past medical history was unremarkable with O + hemotype; she had an abortion due to an anembryonic pregnancy that required curettage, which was performed without complications. The patient had 3 healthy previous pregnancies which resulted in 3 healthy living children. Currently in her fifth pregnancy, she denies pregnancy care; only one obstetric ultrasound performed at 24 weeks' gestation in another clinic reported the following: harmonic fetal growth and no fetal malformations; however polyhydramnios was present. During her observation in the ER, a new ultrasound examination was ordered, which revealed an apparently large placenta with approximate weight of 1,800 gr, suggestive of placental edema; the fetus appeared with polyhydramnios, and no heartbeats nor fetal movements were registered; she was then referred to the high risk obstetric department, where she was found to have normal vital signs, mild edema of the ankles without fovea, and a gravid uterus occupied by a single longitudinal cephalic fetus with lateralized back to the left; fetal heart rate was not detected with doptone; she had regular uterine dynamics palpable at a rate of 3 contractions lasting 60 seconds each, within a time frame of 10 minutes; at vaginal examination the cervix was softened with 4 cm of dilation and 70% thinned, intact amniotic membranes, without bleeding or leucorrhoea. Laboratory tests reported the following: hemoglobin 11.5 g/dl, hematocrit 34.8%, and no other abnormal results including normal renal and hepatic function. Due to increased frequency of contractions, she was immediately sent to the expulsive room, where a single female sex without vitality was spontaneously delivered, with data of hydrops and macerated skin, weight: 1,730 gr, with a grayish and hemorrhagic sacral mass (Figure 2). After resection of the tumor and pathologic examination the following report was made: An 820 gr Type I sacrococcygeal teratoma (SCT) with mature and immature elements as well as blood sequestration areas, partially encapsulated with extensive areas of coagulation and necrosis. Placenta was grossly edematous and weighed 1,280 gr with a marked hydropic change of the villi, with an area of intervillous fibrinoid infarct was noticed. Amnion and chorion had no alterations. The umbilical cord had three blood vessels with marked edema of Wharton's jelly. The patient received counseling and was discharged 3 days after delivery without edema or any other physical alteration.