The healthy kidney removed by mistake

In St. Louis Park, Minnesota, a patient was submitted at Park Nicollet Methodist Hospital to have one of his kidneys removed because it had a tumor believed to be cancerous. Instead, doctors removed the healthy one. 

"The discovery that this was the wrong kidney was made the next day when the pathologist examined the material and found no evidence of any malignancy," said Samuel Carlson, M.D. and Park Nicollet Chief Medical Officer. The potentially cancerous kidney remained intact and functioning. For privacy and family's request, no details about the patient were released.