Introduction:
Large chorioangioma is one of the causes of fetal anemia and heart failure as well as preterm deliveries.

Aim:
The aim of the study was to assess the clinical implications of prenatal diagnosis of chorioangioma and present new treatment options: laser coagulation and embolisation of feeding vessles.

Material and methods:
Chorioangioma was diagnosed in 5 patients (4 singleton pregnancies and 1 dichorionic twin pregnancy). Ultrasound examinations and routine follow-up were performed in these women to detect possible fetal and maternal complications caused by the placental tumor. Pregnancy management, including invasive procedures and outcome, was analyzed.

Results and discussion:
A high proportion of the patients in the study group (80%) required prenatal intervention due to the fetal heart failure or polyhydramnios. Three patients underwent laser coagulation of superficial supplying vessels; embolization of the deep vessel in the tumor was performed in 1 woman with dichorionic twin gestation. One woman opted for termination of pregnancy following an ineffective laser procedure. One pregnancy (20%) was uncomplicated and managed conservatively. In the group of 4 patients after prenatal treatment, all women gave birth to viable neonates; however, in the case of twin gestation, the affected fetus expired.

Conclusions:
Prenatal diagnosis of chorioangioma should entail a detailed follow-up of the patient to detect pregnancy complications early enough to introduce intrauterine treatment, preventing intrauterine fetal demise.