Conjoined twinning is extremely rare congenital malformation occurring in a very low frequency. A 22-year-old woman presented with 33 weeks gestation to an obstetric clinic in active labor. The patient de­li­vered conjoined male twins vaginally. External examination of the infants showed atypical ischiopagus twins. We emphasize that the precise knowledge of anatomic properties of both twins antenatally will help the obstetrician to decide the route of delivery and the pediatric surgeon to decide the surgical approach.

(Gynecol Obstet Reprod Med 2006; 12:000-000)
Key Words: Conjoined twins, Vaginal delivery