The man is known only as Mr. He. He visited the doctor in May because of abdominal pain. A CT scan revealed the 420 kidney stones in his left kidney. Doctors said that had he not come in when he did he would have had to have the kidney removed. These 420 stones are not the world record for kidney stones. According to the Guinness Book of World Records a doctor in India removed 172155 stones from the left kidney of another patient. That surgery took three hours to complete.