“…17 Fewer than 200 cases of fetus in fetu have been reported in the literature since it was first described by Johann Friedrich Meckel in the late 18th century. 12,18 It is most commonly diagnosed after birth in children younger than 18 months of age 16,19 and is located in the retroperitoneal space in 80% of cases. 20,21 Unusual locations of fetus in fetu have been reported in the cranium, 8,9 oropharynx, 13 thorax, 21 sacrum, 10 and genitalia.…”