When doctors performed a standard MRI scan on three-day old Sam Esquibel, they were definitely not ready for what they would find. What looked like a microscopic brain tumor forming, was actually a nearly perfectly formed foot and partial formation of another foot, a hand, and a thigh. A case like this has been given the name "foetus in foetu", which is a twin beginning to form within its sibling, and is rarely seen.
Mr Dominic Thompson, a consultant paediatric neurosurgeon at London's Great Ormond Street Hospital, said there were probably less than 100 recorded cases of foetus in foetu in the medical literature. Sam was operated on without any problems, and all that is remaining of this little foot, is a little scar.