Fetus-in-fetu: confirmation of prenatal diagnosis with MRI.

Fetus-in-fetu is a rare form of monozygotic diamniotic twin pregnancy in which one fetus is enclosed within its twin (Khadaroo et al., 2000). This case report highlights the use of prenatal MRI to confirm prenatal diagnosis of an intra-abdominal FIF to aid obstetricians, neonatologists, and pediatric general surgeons in perinatal and surgical management.