Acar, Türker, Duran Efe, Ahmet Okuş, İrfan Öcal, and Mustafa Harman. 2015. “A Rare Solid Tumor of the Retroperitoneum With Venous Extension and Lung Metastasis: Extra-Gastrointestinal Stromal Tumor”. Turkish Journal of Gastroenterology 26 (4):358-59. https://doi.org/10.5152/tjg.2015.0149.