Rare Conditions

“Mr. and Mrs. Smith, we finally have an answer for you.” The couple, whose real names we are protecting for privacy, looked at me anxiously. I had been evaluating their young daughter, Sally, in my role as a medical geneticist at the Children’s Hospital at Montefiore in the Bronx, a borough of New York City. […]

Some diseases are incredibly rare, but can also be deadly or severely impact quality of life. They can also be traced to lifestyle, with some of them occurring outside the U.S. With that being said, here are nine of the rarest diseases worldwide.