Türker Acar; Duran Efe; Ahmet Okuş; İrfan Öcal; Mustafa Harman. A Rare Solid Tumor of the Retroperitoneum With Venous Extension and Lung Metastasis: Extra-Gastrointestinal Stromal Tumor. Turkish Journal of Gastroenterology 2019, 26, 358-359.