Chorioangioma is the most common type of placental tumor. A primigravida woman was noted on routine scan at 21 weeks of gestation to have a placental mass measuring 1.8 x 2.2cm. A detailed ultrasound scan revealed a well circumscribed, hypoechoic lesion protruding into the amniotic cavity; hence a preliminary diagnosis of placental chorioangioma was made and close prenatal surveillance was scheduled. At 34 weeks of gestation, the mass was measuring 6.27 x 5.38cm. The patient experienced reduced fetal movements at 37 weeks gestation. A small-for-gestational age but normal female neonate was delivered by caesarean section. Histopathological analysis of the placenta confirmed the diagnosis. According to our case, a giant placental chorioangioma may have a favorable outcome without any medical intervention.