Rhabdomyosarcoma (IMAGE) Howard Hughes Medical Institute Caption An electron microscopy image of rhabdomyosarcoma, an aggressive childhood cancer that begins in muscles or other soft tissue, reveals the cellular interior. Credit CTI-EM Core, St. Jude Children's Research Hospital Usage Restrictions Must use with credit. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.