Book ChapterPediatric Soft Tissue Tumors by Ezequiel Trejo-Scorza, Belinda Beatriz Márquez Álvarez, Carlos José Trejo-Scorza and Simón Paz-Ivannovin the book "Soft Tissue Tumors" edited by Fethi Derbel, ISBN 978-953-307-862-5, InTech, November 11, 2011