Surgical resection was performed on a 47-year-old woman for a retroperitoneal mass that weighed 8.5 kg. Histological examination revealed a myxoid sarcomatous tumor. Because diagnosis could not be determined by immunohistochemistry, attention was focused on MDM2 (murine double minute) gene amplification by fluorescence in situ hybridization (FISH) analysis. The tumor was finally determined to b...

Retroperitoneal cystic lymphangioma is a rare benign tumor. Most patients eventually experience some symptoms that necessitate therapeutic intervention. Excision is the treatment of choice, and some cases of laparoscopic resection have been reported. We report another case of a huge retroperitoneal cystic lymphangioma that was successfully excised laparoscopically with the SAND balloon catheter...

Histiocytic sarcoma (HS) is a rare hematopoietic neoplasm. We report a patient with HS treated with induction chemotherapy followed by curative surgery. A 50-year-old man was referred to our hospital because of a retroperitoneal tumor. A computed tomography scan revealed a bulky retroperitoneal mass, infiltrating the surrounding organ. An excisional biopsy confirmed the diagnosis of HS. The tum...

PURPOSE To compare perioperative outcomes, specifically hospital length of stay (LOS), after retroperitoneal and conventional transperitoneal robot-assisted partial nephrectomy (RAPN). PATIENTS AND METHODS We retrospectively compared consecutive patients with a posterior renal mass undergoing retroperitoneal RAPN (n=116) versus transperitoneal RAPN (n=97) at our institution between July 2007 ...

CONTEXT Retroperitoneal sarcomas are rare neoplasms. Computed Tomography or Magnetic Resonance Imaging is performed in patients with these tumors to detect local extent and distant metastases of the tumor and for preoperative surgical planning. However the evaluation and treatment of retroperitoneal sarcomas are challenging because of its rarity and frequent presentation with advanced disease i...

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...

The retroperitoneum is an uncommon location for teratoma in adults. The current study presents the case of a rare giant primary retroperitoneal teratoma in a 55-year-old female. The clinical manifestations, diagnosis and surgical treatment procedure of this case are retrospectively reviewed. The patient presented with a complaint of an abdominal palpable mass and fullness for 1 month. The patie...

Primary retroperitoneal germ cell tumors are extremely rare neoplasms. The most common presenting features are abdominal pain and palpable abdominal masses. Pathological fractures of the spine presenting as bilateral lower leg weakness are exceptionally rare. We describe a 16-year-old girl who developed progressive paraplegia after a minor falling injury. Radiological study demonstrated a huge ...

Gastrointestinal stromal tumor (GIST) is the most common non-epithelial tumor in the gastrointestinal tract. Although GIST occurs mainly in the gastrointestinal tract, it also occurs, rarely, in non-gastrointestinal tract and in this case, it is often named as extra-gastrointestinal stromal tumor (EGIST). We experienced a 68-year-old male patient who had been diagnosed preoperatively with accid...

BACKGROUND Laparoscopic resection of primary retroperitoneal tumors is a challenging procedure because access is difficult due to the deep, posterior location and adjacent major vessels. OBJECTIVE To assess the safety and feasibility of laparoscopic resection of primary nonadrenal retroperitoneal tumors. Method  Data on 20 patients with a diagnosis of primary retroperitoneal tumor who underwe...