Fetus in Fetu: A Rare Presentation in an Adult Female

Fetus in fetu is a rare pathological condition resulting from abnormal embryogenesis in a diamniotic monochorionic pregnancy. This condition is typically observed in childhood or infancy. We report an 18 - year - old female who presented with complaints of generalized abdominal pain. On examination, a lump in the abdomen was noted and diagnosed as fetus in fetu, which was confirmed through histopathological examination.