7Martin RC, Brennan MF. Adult soft tissue Ewing sarcoma or primitive neuroeetodermal tumors : predictors of survival. Arch Surg,2003, 138:281.
8Fuller GN, Scheithauer BW. Symposium: The 2007 revised world health organization (WHO) classification of tumors of the central nervous system: newly codified entities. Brain Pathot ,2007,17:304.
9Dehner LP. Primitive neuroectodermal tumor and Ewing' s sarcoma. Am J Surg Pathol, 1993,17 : 1.
10Parham DM, Roloson GJ, Feely M, et al. Primary malignant neuroepi-thelial tumors of the kidney:a clinicopathologic analysis of 146 aduhand pediatric cases from the National Wilms' Tumor Study Group Pa-thology Center. Am J Surg Pathol,2001,25 :133.