Sariyuce O, Ozsan O, Muezzinoglu B, Ozkan S, Gurpinar T, Aydin E. Benign retroperitoneal schwannoma : a rare cause of flank pain . Ann Med Res . 2021;5(1):0073-0077. Accessed August 25, 2026. http://www.annalsmedres.org/index.php/aomr/article/view/2654