Synovial sarcoma is a rare type of soft tissue sarcoma that arises in tissues containing synovial fluid, usually in the extremities. It has only rare occurrence in the retroperitoneal space. Early detection of retroperitoneal synovial sarcoma is difficult, since the retroperitoneal space is highly expandable and deeply hidden. Furthermore, the presenting symptoms are often vague and nonspecific...

Leiomyomas are very common benign tumors in the uterus and it is rare condition to present the retroperitoneal leiomyoma. The author reported a 48-year-old female patient who presented right pelvic mass with urinary incontinence and lower abdominal discomfort. Based on the preoperative imaging, provisional diagnosis was mesenchymal sarcoma. In the intraoperative findings, huge mass abutting to ...

background: giant retroperitoneal uterine leiomyomas are uncommon. degenerative changes of a leiomyoma may lead to unusual presentation resulting in misdiagnosis preoperatively. the final diagnosis can be made either intraoperatively or histologically. case: we report a 45-year-old multiparous women presented with abdominal distension and fatigue for six months. abdominopelvic sonography and co...

We report the case of a large lumbar schwannoma eroding the vertebra and originating from spinal canal with invasion of the retroperitoneal space. We also review all the cases in literature reporting lumbar schwannomas eroding the vertebral bodies and invading the retroperitoneal space focusing on the surgical strategies to manage them. Spinal CT-scan revealed a 44 mm × 55 mm inhomogeneous soft...

A rare case of coexisting retroperitoneal and mediastinal fibrosis is reported. Increasing awareness of this association may lead to earlier recognition of significant symptoms and more effective therapy.

[This corrects the article on p. 149 in vol. 92, PMID: 28289669.].

We report a case of an extremely rare primary malignant melanoma presenting in the retroperitomeum, indurcing a diagnostic and management problem.