Fetus in Fetu (FIF): A Rare Case Report in Adult Male

Fetus in fetu (FIF) is a very rare condition in which malformed fetus is found within the body of a living twin, most commonly within the retroperitoneum. It is a parasitic fetal twin of a diamniotic, monozygotic type1. Despite its prevalence among infants and children, there have been reports of cases in which the anomaly had remained asymptomatic until later ages3. It should be differentiated from teratoma by the presence of organized vertebral column and appropriately arranged other organs or limbs around it1. Here is a case of Fetus in fetu in a 20 - year - old man who presented with nonspecific abdominal symptoms. The diagnosis of FIF was made on the basis of CT abdomen findings. For the definitive management the patient underwent exploratory laparotomy with complete excision of mass which was proven to be FIF on the basis of gross and histopathological examination.