Corioangioma placentario gigante.

Chorioangioma is a benign, non-trophoblastic placental tumor associated with lethal complications for the fetus. A 20-year-old primiparous woman with a gestational age of 28.5 weeks went to the Hospital General «Dr. Miguel Silva» in Morelia, Michoacán, with threatened preterm labor secondary to polyhydramnios. An obstetric ultrasound showed a hypoechoic image in the placenta measuring 6 x 4 x 7 cm, and abundant internal vascularity was visible with color Doppler. Tocolytic measures were successfully implemented and pharmacological treatment was administered for the polyhydramnios. A cesarean section was performed at week 35 of gestation because of severe oligohydramnios. A male singleton infant weighing 2,130 g was delivered; Apgar score 8/9. The placenta had a discoid shape and measured 22 x 16 x 4 cm. The fetal side was smooth and congestive. Dissection revealed a tumor measuring 7 x 6 x 4 cm. It had a nodular appearance with areas of extensive hemorrhaging. Microscopically, the tumor mass consisted of capillaries presenting areas of infarction and dystrophic calcification. Ultrasound is the main tool for early diagnosis. Doppler ultrasound is essential for the differential diagnosis of this pathology with other solid intraparenchymal placental tumors. [ABSTRACT FROM AUTHOR]