In a rare disorder, a 17-year-old Chinese girl has been found with four kidneys. Xiaolin was healthy all her childhood but visited hospital for treatment after having lower back pain regularly. An ultrasound she underwent showed her with four kidneys, leaving people shocked, state-run People’s Daily reported. A doctor related to the case explained that it was a disease called renal duplex monstrosity.

“The mortality rate for this is one in 1,500 people, which means most of the people would not even realise they have this problem,” a doctor said.