Malignant mesenchymoma is an interesting but very rare tumor in which malignant differentiation has occurred twice or more. We report a case of retroperitoneal malignant mesenchymoma consisting of osteosarcoma, leiomyosarcoma, liposarcoma and fibrosarcoma. Abdominal CT showed a large retroperitoneal mass with two separate and distinct parts, namely an area of prominent calcification and one of clearly enhancing solid components. The mass contained histologically distinct tumorous components with no histologic admixure at the interfaces. The densely calcified nodule corresponded to osteosarcoma, and the noncalcified clearly enhancing nodules to leiomyosarcoma, liposarcoma and fibrosarcoma.
Case Report ; Fibrosarcoma/*radiography ; Human ; Leiomyosarcoma/*radiography ; Liposarcoma/*radiography ; Male ; Mesenchymoma/*radiography ; Middle Age ; Osteosarcoma/*radiography ; Retroperitoneal Neoplasms/*radiography ; Tomography, X-Ray Computed

Forty-four cases of abdominal and pelvic computerized tomography (CT) for urological evaluation were reviewed and analyzed as follows: Computerized tomography is a very convenient and non-invasive method to evaluate stages of renal tumor and is more superior in diagnosing hypoplastic kidney and hamartoma than ordinary renal angiography and ultrasonography. Computerized tomography is more informative in evaluation of retroperitoneal space than conventional radiography. It is almost impossible or very difficult to differentiate stage of the bladder tumor A, B1 and B2. Stages beyond C and mass in the pelvic cavity can be detected with relative accuracy. Lymph node metastasis into the retroperitoneal space in testis tumor is diagnosed by computerized tomography.
Angiography ; Hamartoma ; Kidney ; Lymph Nodes ; Neoplasm Metastasis ; Radiography ; Retroperitoneal Space ; Testis ; Ultrasonography ; Urinary Bladder Neoplasms ; Urology*

A case of a 36-yr-old woman with retroperitoneal synovial sarcoma is described. Her presenting symptom was epigastric pain that radiating to the back. On radiologic study, bulky retropancreatic soft tissue mass was detected which showed cystic and solid components. At operation, complete resection of the tumor was not possible because of the adhesion to the vena cava and the liver. During the follow-up, extensive tumor recurrence and liver metastasis were revealed. Primary retroperitoneal synovial sarcoma is a very rare malignant tumor with high mortality and recurrence rates. Retroperitoneal synovial sarcoma usually appears as a nonspecific soft tissue mass that do not have specific imaging features differentiating it from other mesenchymal tumors. However general radiologic findings and anatomic location of the tumor may help the diagnosis. In addition, synovial sarcoma should be included in the differential diagnosis of retroperitoneal soft tissue mass detected in young adults.
Adult ; Female ; Humans ; Retroperitoneal Neoplasms/*pathology/radiography/surgery ; Sarcoma, Synovial/*pathology/radiography/surgery ; Tomography, X-Ray Computed

Retroperitoneal fibrosis was first described in 1905 by Albarran, a French urologist, who performed ureterolysis for ureteral compression produced by the disease. However, this disease became an established clinical entity by Ormond's account in the English literature in 1948. Pericystitis plastica has been used the define an extremely rare type of Idiopathic retroperitoneal fibrosis (IRF) constricting the bladder. In this study, we discussed the recovery of 29-year-old woman with pericystitis plastica who was misdiagnosed as pelvic malignancy or a chronic/subacut pelvic inflammation at the first evaluation.
Adult ; Cystitis/*radiography ; Diagnosis, Differential ; Female ; Human ; Pelvic Inflammatory Disease/*radiography ; Pelvic Neoplasms/*radiography ; Retroperitoneal Fibrosis/*radiography ; *Tomography, X-Ray Computed

There are a variety of fat-containing lesions that can arise in the intraperitoneal cavity and retroperitoneal space. Some of these fat-containing lesions, such as liposarcoma and retroperitoneal teratoma, have to be resected, although resection can be deferred for others, such as adrenal adenoma, myelolipoma, angiomyolipoma, ovarian teratoma, and lipoma, until the lesions become large or symptomatic. The third group tumors (i.e., mesenteric panniculitis and pseudolipoma of Glisson's capsule) require medical treatment or no treatment at all. Identifying factors such as whether the fat is macroscopic or microscopic within the lesion, the origin of the lesions, and the presence of combined calcification is important for narrowing the differential diagnosis. The development and wide-spread use of modern imaging modalities make identification of these factors easier so narrowing the differential diagnosis is possible. At the same time, lesions that do not require immediate treatment are being incidentally found at an increasing rate with these same imaging techniques. Thus, the questions about the treatment methods have become increasingly important. Classifying lesions in terms of the necessity of performing surgical treatment can provide important information to clinicians, and this is the one of a radiologist's key responsibilities.
Abdominal Fat/pathology/radiography ; Adult ; Aged ; Diagnosis, Differential ; Female ; Humans ; Magnetic Resonance Imaging/methods ; Male ; Middle Aged ; Neoplasms, Adipose Tissue/*pathology/*radiography ; Peritoneal Cavity/pathology/radiography ; Peritoneal Diseases/pathology/radiography ; Peritoneal Neoplasms/*pathology/*radiography ; Retroperitoneal Neoplasms/*pathology/*radiography ; Retroperitoneal Space/pathology/radiography ; Tomography, Spiral Computed/methods ; Young Adult

A complete surgical resection is the only proven therapeutic modality that prolongs the survival in patients with leiomyosarcoma of the inferior vena cava (IVC). Reconstruction of the IVC is not always necessary but is often required to facilitate venous drainage of the kidney for the tumors at the pararenal area of the IVC. Controversy exists in postoperative adjuvant therapy. Recently, we experienced four cases of pararenal leiomyosarcoma of the IVC, of which treatment consisted of a complete resection of the tumor, ringed polytetrafluoroethylene (PTFE) graft interposition, and bilateral renal vein reconstructions in all patients. Postoperative radiation therapy was instituted in 3 of 4 patients. One patient who did not receive the postoperative radiation therapy was treated with adjuvant chemotherapy. The kidneys were preserved in all patients and no deep vein thrombosis (DVT) or venous insufficiency of the lower extremity veins developed. Distant metastasis to the lung was noted in one patient at 18 months after surgery, who was not received the postoperative radiation therapy but chemotherapy. In conclusion, a complete resection of the tumor, IVC reconstruction, and bilateral renal vein reconstruction followed by adjuvant radiation therapy is recommended for the treatment of pararenal leiomyosarcoma of the IVC.
Adult ; Combined Modality Therapy ; Female ; Human ; Leiomyosarcoma/radiography/*radiotherapy/*surgery ; Middle Aged ; Neoplasm Recurrence, Local/radiography/radiotherapy/surgery ; Retroperitoneal Neoplasms/radiography/radiotherapy/surgery ; Retrospective Studies ; Treatment Outcome ; Vascular Neoplasms/radiography/*radiotherapy/*surgery ; *Vena Cava, Inferior

Follicular dendritic cell sarcoma is a rare neoplasm that originates from follicular dendritic cells in lymphoid follicles. This disease usually involves the lymph nodes, and especially the head and neck area. Rarely, extranodal sites may be affected, including tonsil, the oral cavity, liver, spleen and the gastrointestinal tract. We report here on the imaging findings of follicular dendritic cell sarcoma of the abdomen that involved the retroperitoneal lymph nodes and colon. It shows as a well-defined, enhancing homogenous mass with internal necrosis and regional lymphadenopathy.
Abdomen/ultrasonography ; Abdominal Neoplasms/complications/*radiography/*ultrasonography ; Abdominal Pain/etiology ; Aged ; Colon/radiography/ultrasonography ; Colonic Neoplasms/complications/*radiography/*ultrasonography ; Dendritic Cell Sarcoma, Follicular/complications/*radiography/*ultrasonography ; Dendritic Cells, Follicular/radiography/ultrasonography ; Diagnosis, Differential ; Dyspepsia/etiology ; Female ; Gastrointestinal Hemorrhage/etiology ; Humans ; Lymph Nodes ; Male ; Middle Aged ; Radiography, Abdominal/methods ; Retroperitoneal Space/radiography/ultrasonography ; Tomography, X-Ray Computed/methods

Percutaneous access to the surgical bed after pancreaticoduodenectomy can be a challenge, due to the post-operative anatomy alteration. However, immediate complications, such as surgical bed abscess or suspected tumor recurrence, are often best accessed percutaneously, as open surgical or endoscopic approaches are often difficult, if not impossible. We, hereby, describe a safe approach that is highly replicable, in accessing the surgical bed for percutaneous intervention, following pancreaticoduodenectomy.
Abscess/radiography/therapy ; Bile Duct Neoplasms/pathology/radiography ; Biopsy/methods ; Catheterization/*methods ; Cholangiocarcinoma/pathology/radiography ; Drainage/instrumentation/*methods ; Humans ; Male ; Middle Aged ; Neoplasm Recurrence, Local/pathology/radiography ; Pancreatic Diseases/radiography/therapy ; *Pancreaticoduodenectomy ; Postoperative Complications/radiography/*therapy ; Radiography, Interventional/methods ; Retroperitoneal Space

If a testicular cancer patient has a mass in the retroperitoneum, a metastasis is often the first suspicion, probably leading to improper diagnosis and overtreatment. Here we report a case of retroperitoneal schwannoma mimicking metastatic seminoma. A 29-year-old man, who had a history of seminoma, presented with a single retroperitoneal mass suspected to be a metastasis. Because the patient refused radiotherapy, 3 cycles of cisplatin, etoposide, and bleomycin were offered. Post-chemotherapy computed tomography scan revealed persistence of the retroperitoneal mass, with no change in tumor size or characteristics. Subsequently, retroperitoneal lymph node dissection was performed. The dissected tissue contained negative lymph nodes but a single mass in the attached fat. Pathology revealed retroperitoneal schwannoma, which was confirmed by immunohistochemistry. Thus, clinicians should be aware of retroperitoneal schwannoma and its distinction from metastatic seminoma to avoid misdiagnosis and ensure proper treatment.
Adult ; Antibiotics, Antineoplastic ; therapeutic use ; Antineoplastic Agents ; therapeutic use ; Antineoplastic Agents, Phytogenic ; therapeutic use ; Bleomycin ; therapeutic use ; Cisplatin ; therapeutic use ; Diagnostic Errors ; Etoposide ; therapeutic use ; Humans ; Lymph Node Excision ; Lymph Nodes ; pathology ; Lymphatic Metastasis ; Male ; Neoplasms, Multiple Primary ; Neurilemmoma ; diagnostic imaging ; drug therapy ; pathology ; Radiography ; Retroperitoneal Neoplasms ; diagnostic imaging ; drug therapy ; pathology ; secondary ; Retroperitoneal Space ; Seminoma ; secondary ; surgery ; Testicular Neoplasms ; surgery

We report here on a case of primary extraskeletal mesenchymal chondrosarcoma that arose from the pancreas. A 41-year-old man was evaluated by CT to find the cause of his abdominal pain. The CT scans showed a heterogeneously enhancing necrotic mass with numerous areas of coarse calcification, and this was located in the left side of the retroperitoneal space and involved the body and tail of the pancreas. Portal venography via the celiac axis also showed invasion of the splenic vein. Following excision of the mass, it was pathologically confirmed to be primary extraskeletal mesenchymal chondrosarcoma that arose from the pancreas.
Abdominal Pain/etiology ; Adult ; Chondrosarcoma, Mesenchymal/complications/*diagnosis/surgery ; Contrast Media/administration & dosage ; Diagnosis, Differential ; Humans ; Iohexol/analogs & derivatives/diagnostic use ; Male ; Necrosis ; Pancreas/pathology/radiography ; Pancreatic Neoplasms/complications/*diagnosis/surgery ; Portal Vein/radiography ; Radiographic Image Enhancement/methods ; Rare Diseases ; Retroperitoneal Space/radiography ; Splenic Vein/radiography ; Tomography, X-Ray Computed/methods