Placental Chorioangioma occurs in 1% of pregnancies and are generally asymptomatic. However, they are known to cause a number of complications which are detrimental to the mother, fetus or the neonate. A typical case where acute polyhydramnios precipitated premature labour and delivery of the fetus as a result of a large placental chorioangioma is presented. A brief review of the other possible complications are also included.