‘Parasitic’ twin discovered inside three-year-old boy

Doctors in Peru have found a "parasitic twin" in the stomach of a three-year-old boy, and plan to surgically remove the tissue.

Dr Carlos Astocondor of the medical team at Las Mercedes Hospital in the northern port of Chiclayo said the condition occurs in about one of every 500,000 live births.

He said the partially formed foetus weighs a pound and a half and is nine inches long.