Giant primary retroperitoneal leiomyoma - a case report

Leiomyomas are benign smooth muscle tumors that usually arise from the uterus. Isolated retroperitoneal leiomyoma is very rare. It usually coexists with uterine leiomyoma or part of a disseminated disease. We report a 41-year-old multiparous women presented with abdominal discomfort and left Loin pain for six months. Abdominopelvic Sonography , computed tomography and MRI showed a large cystic mass that filled the left retroperitoneum around the ureter and pushing the kidney upwards. With the preoperative diagnosis of a malignant tumor, an exploratory laparotomy was planned. Intraoperatively, a cystic mass originated from the retroperitoneum surrounding the ureter was observed. it was completely resected and sent for histopathological examination, which came as retroperitoneal leiomyoma, confirmed with immunohistochemical staining.