Retroperitoneal Extra-gastrointestinal Stromal Tumor Presenting With Lower Urinary Tract Symptoms

Gastrointestinal stromal tumors are rare soft-tissue neoplasms, the incidence of which is 1–3% of all malignant gastrointestinal tumors. Tumor size is reported to be a major determinant of recurrence in patients with resectable gastrointestinal stromal tumors. Here, we describe our experience in managing a large extra-gastrointestinal stromal tumor arising from the retroperitoneum.