Rachael Rettner

When a Brazilian man went to the doctor complaining of low-back pain, his doctors got a surprise: They discovered that the man had not two, but three kidneys — a very rare condition.

To figure out the cause of the 38-year-old man’s severe pain, doctors at the Hospital do Rim in São Paulo, Brazil, performed a CT scan to evaluate the area, according to a report of the case, published Wednesday (May 6) in The New England Journal of Medicine (NEJM).

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