Fetus in fetu (FIF) in pregnancy describes a fascinatingly rare congenital anomaly where an undeveloped, parasitic monozygotic twin is found encased within the body of its co-twin, known as the host twin. Crucially, due to its asymptomatic nature throughout pregnancy, FIF is typically not detected or diagnosed until after the child is born.
Understanding Fetus in Fetu (FIF)
Fetus in fetu literally translates to "fetus within a fetus." It's an extraordinary event of monozygotic twinning, where one
