Myoteri, D. Dellaportas, D. Nastos, C. Gioti, I. and Gkiokas, G. Carvounis, E. Theodosopoulos, T., Retroperitoneal Solitary Fibrous Tumor: A “Patternless” Tumor, Case Reports in Oncological Medicine, (2017), 2017, HINDAWI LTD, 2090-6706, 2090-6714