Chorioangioma is the most common benign placental tumor arising from the chorionic stroma and capillaries, and
histologically accounts for about 1% of placental tumors1). It rarely exceeds 5 cm in diameter, and is clinically diagnosed in 1
out of every 8,000-50,000 patients1). We report a patient with a relatively large chorioangioma (10 cm in diameter) accompanied
by polyhydramnios.
