Baby born with ‘twin’ fetus inside her stomach

A baby in Israel was born with her own “twin” inside her stomach — a rare phenomenon known as “fetus in fetu,” according to news reports.

Doctors first realized there might be a problem when they performed a late-pregnancy ultrasound on the baby’s mother and saw that the baby’s stomach was enlarged, according to The Times of Israel.

So when the baby was born, doctors performed a number of tests, including ultrasounds and X-rays, and spotted a partially developed fetus inside the baby’s abdomen, The Times of Israel reported. Doctors performed an operation to remove the fetus.

The term “fetus in fetu,” which literally means “fetus within fetus,” is generally defined as a condition in which a developmentally abnormal fetus is found inside the body of its otherwise healthy twin, Live Science previously reported. The condition is extremely rare, occurring in about 1 in 500,000 births, according to a 2010 report on the phenomenon, published in the Journal of Surgical Technique and Case Report.