Unexpected discoveries in the quest to cure an extraordinary skeletal condition show how medically relevant rare diseases can be.
When Jeannie Peeper was born in 1958, there was only one thing amiss: her big toes were short and crooked. Doctors fitted her with toe braces and sent her home. Two months later, a bulbous swelling appeared on the back of Peeper’s head. Her parents didn’t know why: she hadn’t hit her head on the side of her crib; she didn’t have an infected scratch. After a few days, the swelling vanished as quickly as it had arrived.
When Peeper’s mother noticed that the baby couldn’t open her mouth as wide as her sisters and brothers, she took her to the first of various doctors, seeking an explanation for her seemingly random assortment of symptoms. Peeper was 4 when the Mayo Clinic confirmed a diagnosis: she had a disorder known as fibrodysplasia ossificans progressiva (FOP).
The name meant nothing to Peeper’s parents—unsurprising, given that it is one of the rarest diseases in the world. One in 2 million people have it.
For the rest of the story: http://www.theatlantic.com/magazine/archive/2013/06/the-mystery-of-the-second-skeleton/309305/