Retroperitoneal fibrosis is characterized by development of extensive fibrosis, leading to entrapment and obstruction of retroperitoneal structures, notably the ureters. In most cases, the etiology is unknown. It is occasionally associated with autoimmune diseases. Response to corticosteroids and immunosuppressive therapy suggest it is probably immunologically mediated. The symptoms and signs a...

Introduction: Retroperitoneal cystic lymphangioma is a rare benign tumor of the retroperitoneal lymphatics that usually manifests in infancy. It is worth to Report of unexpected presentation especially in Adult. Case Presentation: An adult patient with Left Lower abdominal pain was referred to our hospital. Abdominal ultrasonography revealed a large, multilocular, cystic mass with an obscure ma...

ring predominantly in the kidney. Extrarenal AMLs are rare, and those occurring in the retroperitoneal perinephric space are extremely rare, with only 13 previously reported cases (1-3). An AML in the perinephric space is a fat-containing tumor and is difficult to differentiate from other fatty lesions including lipomatosis, lipoma, and liposarcoma. We report a case of AML of the perinephric sp...

Introduction: We report an interesting case of a 67-year-old female presented with symptomatic cholelithiasis and was found to have an occult retroperitoneal sarcoma on work up. Case Report: A 67-year-old female was referred to the surgery clinic by the gynecology service for symptomatic cholelithiasis. On examination, she was moderately obese with mild right upper quadrant tenderness and a red...

BACKGROUND Primary retroperitoneal mucinous cystadenoma of borderline malignancy represents a rare tumor, with unclear histogenesis, concerning almost exclusively women. Only two cases concerning male patients have been reported. CASE REPORT We herein report a case of a 37 year old man undergone laparotomy for a sizable retroperitoneal tumor resulting after the histological examination to a p...

introduction hemangiopericytomas (hpcs) are rare neoplasms which account for approximately 1% of primary vascular tumors. case presentation we report a 73 years old woman with vague abdominal pain who did not have further significant symptoms and was diagnosed to have retroperitoneal hemangiopericytoma. discussion the tumor was initially diagnosed by ultrasound evaluation. mri showed a lobulate...

malignant peripheral nerve-sheath tumor (mpnst) is a high-grade malignant tumor of ecto-mesenchymal origin comprising approximately 10% of soft-tissue sarcomas. they tend to occur associated with neurofibromatosis or sporadically. here we report a mpnst at an extremely rare location and behavior causing disappearance of the entire kidney. patient evaluation included clinical, biochemical and ra...