Butler County Times Gazette EL DORADO, Kansas - Over a month ago, Marjorie and Tyler Rumiser noticed their son's eye was swelling up. At first, the parents and a doctor thought it was allergies, but they noticed the medication wasn't working. The swelling got to a point where it shut his eye and affected his sight. Immediately, the parents rushed their son, Oliver, to the doctor. A day later, Oliver was in Kansas City having surgery to remove a tumor. Doctors found out what was wrong and diagnosed Oliver with rhabdomyosarcoma, a rare and aggressive childhood cancer. Rhabdomyosarcoma is a cancer that affects soft tissue and connective tissue attached to the bone.