just to walk. at some point, i knew if it continued, it would kill me. >> she saw countless medical specialis specialists. no one had an explanation. dr. gahl was trying to solve the mystery. >> this is super impressive. i mean you can literally see a cleavage in the middle of her back because the muscles are so big. dr. gahl is the lead investigator. >> bones aren't involved. just confined to the muscle. >> during a week of intense tests, there are scans, bloodwork, examination of everything going on inside sally's body. >> this is her brain. it's incredible. >> when the images were found, it was seen the muscles, even the muscles that govern the movement of the eye, really