The fetal triploidy syndrome presentations include intrauterine growth retardation, hydrocephalus, oligohydramnios, and cystic changes of the placenta. Although the majority of triploid conceptions abort spontaneously in the first trimester, rarely they progress to term. Determination of the karyotype is important for the management of a pregnancy with a live fetus, and has implications for genetic counseling of subsequent pregnancies. We present a case of fetal triplody syndrome with large placental cyst and hydrocephalus.

Key Words: Triploidy, Antenatal ultrasonography, Placental cyst, Congenital malformations, Karyotype.

1.           Jones KL. Triploidy syndrome and diploid/triploid mixoploidy syndrome. In: Smith's Recognizable Patterns of Human Malformation, 4th ed. Philadelphia: WB Saunders Company, 1988;32–3.

2.           Rubenstein JB, Swayne LC, Dise CA, Gersen SL, Schwartz JR, Risk A. Placental changes in fetal triploidy syndrome.J Ultrasound Med. 1986 Oct;5(10):545-50.

3.           Vladareanu R, Tutunaru D, Alexandru B, Veduta A,  Zvanca M. Ultrasound in prenatal diagnosis of triploidy and turner syndrome. Gynaecol Perinatol 2006;15(4):192–201.

4.           Leisti JT, Raivio KO, Rapola MH, Saksela EJ, Aula PP. The phenotype of human triploidy. Birth Defects Orig Artic Ser 1974;10:248–53.