When retroperitoneal leiomyosarcoma develops in pelvic cavity, it often presents similar symptoms and radiological findings to adnexal tumor, therefore obscures diagnostic approaches until an exploratory laparotomy is performed. We report an unusual presentation of retroperitoneal leiomyosarcoma mimicking an adnexal tumor with extremely elevated serum CA-19-9. Though the most of the prominent m...

We herein present a case of unicentric type Castleman’s disease (CD) arising in the retroperitoneal space. An asymptomatic 44-year-old male was noted to have an abdominal mass during his annual health checkup. The only abnormal finding on laboratory testing was an increased erythrocyte sedimentation rate. Preoperative imaging studies led to a possible diagnosis of unicentric type CD in the retr...

A 73-year-old male was referred to our department for further treatment of a right retroperitoneal tumor. Contrast CT showed a tumor mass measuring 33 × 26 mm in size with poor contrast enhancement. Because we were unable to rule out tumor malignancy, we planned an operation. The tumor was easily separated and removed without nephrectomy. Histological study revealed a schwannoma. It is rare for...

Resection of retroperitoneal tumors is usually performed using the anterior retroperitoneal approach. Our report presents an innovative method utilizing a robotic surgical system. A 50-yr-old male patient visited our hospital due to a known paravertebral mass. Magnetic resonance imaging showed a well-encapsulated mass slightly abutting the abdominal aorta and left psoas muscle at the L4-L5 leve...

Retroperitoneal malignant mesenchymoma is a rare retroperitoneal neoplasm with poor prognosis. Here we present a patient with retroperitoneal malignant mesenchymoma. A 32year-old man presented with progressive painful swelling on his left lower leg, abdominal fullness and a palpable left abdominal mass. Imaging studies of abdomen included sonography, contrastenhanced computed tomography (CECT) ...

We describe a 48-year-old woman with ruptured retroperitoneal mucinous cystadenoma with borderline malignancy resulting in death for postoperative intestinal compression. The patient was referred to our institution for abdominal mass with preoperative ultrasonography and computed tomography (CT) revealing retroperitoneal mass. At operation, the 12×9 cm retroperitoneal tumor had ruptured. Tumor ...

Introduction Solitary fibrous tumor is a rare type of mesenchymal, spindle-cell tumor reported mostly in the pleura. Retroperitoneal occurrence is rare and histopathological diagnosis is challenging. Case Presentation A 55-year-old woman with nonspecific abdominal pain was found to have a retroperitoneal/pelvic mass adjacent to the upper rectum. The patient underwent surgical resection in cle...

INTRODUCTION There are few case reports of retroperitoneal tumor excision using the robotic technique. We describe a case of a 13 × 9 × 7- cm retroperitoneal schwannoma that was excised using robot-assisted surgery to provide a minimally invasive benefit to the patient. CASE REPORT A 45-year-old woman presented with a right paracaval retroperitoneal lump with well-defined margins displacing t...