A fetus excised from the small intestinal mesentery of a neonate (fetus in fetu): a case report

Background: Fetus in fetu is a rare congenital anomaly. Its incidence is 1/500,000 births. So, pediatric surgeons may encounter this pathology only once or twice during their professional careers. Case presentation: We present a rare case of a fetus extracted from the small intestinal mesentery of a healthy neonate who was explored after delivery. The extracted fetal mass included a fully differentiated skull and limbs with a celomic cavity. The fetal mass was supplied by a main feeding vessel branching from the superior mesenteric artery. Conclusion: Fetus in fetu, despite being a rare variant, must be kept in mind when dealing with a neonatal abdominal mass showing bony parts on radiography.