finally, yuki was found to have an extremely rare children's cancer called latimo blastoma. her parents noticed something was wrong, and over a year had passed. >> translator: i do wish that a specialist had discovered her cancer while it was still at an early stage. >> translator: if the cancer is discovered early and if it isn't too close to an area that affects vision, there is a strong possibility of saving the child's eyesight. >> reporter: there are other cases in which children have such rare forms of cancer that doctors find it hart to diagnose. yusei kihara is now 6. three years ago doctors found he had a tumor in his left thigh. however, over period of two months he was misdiagnosed three times before the exact form of cancer is discovered. li pos p liposarcoma. by the time his condition was correctly understood, he had already undergone the wrong chemotherapy, causing serious side effects. >> translator: this is a country with advanced medical facilities, but there are very few places that know how to treat small children with diseases like this. >> reporter: in t