To evaluate MR findings of soft tissue masses in extremities and to find the helpful findings of distinguish benignity from malignancy, 28 soft tissue masses (22 benign and 6 malignant) in extremities were reviewed. T1-weighted, proton density, T2-weighted and Gd-DTPA enhanced images were obtained. MR images allowed a specific diagnosis in a large number of benign masses, such as hemangioma(8/9), lipoma(2/2), angiolipoma(1/1), epidermoid cyst(2/2), myositis ossificans(1/1), synovial chondromatosis(1/1) and pigmented villonodular synovitis (1/2). Specific diagnosis was difficult in the rest of the masses including malignancy. However, inhomogenous signal intensities with necrosis and inhomogenous enhancement may suggest malignant masses.
Diagnosis ; Extremities ; Gadolinium DTPA ; Myositis ; Necrosis ; Protons ; Synovitis, Pigmented Villonodular

Plgmented villonodular synovitis is a benigh lesion that develops in joint lining and is characterized by an exuberant inflammation. Many authors have discussed etiology, clinical and radiological features, pathology and treatment regarding the disease. This occurs most commonly in the knee joint as a monoarticular proliferative process, but rarely in the hip joint. It is a nonneoplastic disease but may develop as an aggressive local process with bone and joint destruction. Sometimes clinician can not detect it in early time because of its nonspecific clinical findings and misdiagnose it as sarcomatous process. So, early diagnosis of hip joint involvement is necessary because destruction of the femoral head and acetabulum is the ultimate outcome if treatment is not intiated. We report two cases of pigmented villonodular synovitis involving the hip joint, which were diagnosed and treated in our department.
Acetabulum ; Early Diagnosis ; Head ; Hip Joint ; Hip ; Inflammation ; Joints ; Knee Joint ; Pathology ; Synovitis ; Synovitis, Pigmented Villonodular

Diagnostic Errors ; Humans ; Knee Joint ; Male ; Middle Aged ; Synovitis, Pigmented Villonodular ; diagnosis ; Tuberculosis, Osteoarticular ; diagnosis

Buttocks ; pathology ; Humans ; Muscle Neoplasms ; diagnosis ; Muscle, Skeletal ; pathology ; Synovitis, Pigmented Villonodular ; diagnosis

The occurrence of PVNS in the TMJ is very rare. We report a case of PVNS which was misdiagnosed as a parotid tumor at first. CT and conventional radiograph revealed a well difined mass demonstrating higher attenuation than adjacent soft tissue. Erosion, expansion of the cortical plate of the mandibular condyle and sclerotic change beneath the margin of the lesion were also shown. MRI demonstrated well defined mass of very low signal intensity on both T1 and T2 image due to ferromagnetic effect and more clearly delineated the extent of the lesion. Ultrasonogram showed homogenous hypoechoic lesion growing toward both condyle and adjacent soft tissue. Histopathologic findings and characteristic appearance of the various imaging method were discribed and the usefulness of these image for diagnosis and pretreatment evaluation of the PVNS were also discussed on this paper.
Diagnosis ; Diagnostic Imaging* ; Magnetic Resonance Imaging ; Magnets ; Mandibular Condyle ; Synovitis, Pigmented Villonodular* ; Temporomandibular Joint* ; Ultrasonography

PURPOSE: To describe the magnetic resonance (MR) findings of pigmented villonodular synovitis(PVNS) of the knee, and to evaluate the clinical value of MR in the diagnosis of PVNS. MATERIALS AND METHODS:MR imagings of seven patients with PVNS were studied. The type of lesion, presence of bony erosion, the signal intensity, and the relationship between contrast enhancement and signal intensity on T2-weighted images were analyzed, retrospectively. RESULTS: The lesion was mainly villous in three patients and nodular in four, and bony erosion was seen in one patient. On T2-weighted image, the signal intensity of the villous form was mixed iso- and hypointense in two, hypointense in one, and that of the nodular form was heterogeneous with hypo-, iso-, and hyperintensities. The hypointense portion on T2-weighted image showed poor contrast enhancement, which may suggest hemosiderin deposition or advanced fibrosis. The iso- or hyperintense portion on T2-weighted image showed strong enhancement, which suggest active cellular proliferation. CONCLUSION:MR imaging could be a very useful modality in the diagnosis as well as prediction of histological findings of the PVNS.
Cell Proliferation ; Diagnosis ; Fibrosis ; Hemosiderin ; Humans ; Knee* ; Magnetic Resonance Imaging* ; Retrospective Studies ; Synovitis, Pigmented Villonodular*

Adult ; Ankle Joint ; surgery ; Female ; Humans ; Male ; Middle Aged ; Synovitis, Pigmented Villonodular ; diagnosis ; surgery

Pigmented villonodular synovitis is a benign tumor arising from synovial fibroblasts or histiocytes. There are diffuse and localized forms: the former involves the entire synovium and the latter consists of nodules, small tumefactions, or pedunculated masses. The knee is the joint most commonly affected and the clinical diagnosis is difficult, so initial misdiagnosis is common. We report a case of pigmented villonodular synovitis developing in the knee of rheumatoid arthritis (RA) patient, mistaken for an RA flare-up.
Arthritis, Rheumatoid ; Diagnosis ; Diagnostic Errors ; Fibroblasts ; Histiocytes ; Humans ; Joints ; Knee ; Synovial Membrane ; Synovitis, Pigmented Villonodular

Villonodular synovitis, also called pigmented villonodular synovitis, is the benign lesion with the characteristic of locally aggressive proliferation of mononuclear histiocyte and giant cell. Typically it involves single joint, especially about 80% of disease occurs in the knee joint. Villonodular synovitis of the temporomandibular joint is very rare disease. Differential diagnosis includes synovial chondromatosis and tumors of the temporomandibular joint. Optimal treatment consists of complete excision of the mass and removal of the synovium including adjacent affected bony structures. This is a case report of villonodular synovitis developed in the temporomandibular joint.
Chondromatosis, Synovial ; Diagnosis, Differential ; Giant Cells ; Histiocytes ; Joints ; Knee Joint ; Rare Diseases ; Synovial Membrane ; Synovitis ; Synovitis, Pigmented Villonodular ; Temporomandibular Joint

The results of arthroscopic synovectomy of the knee joints were reviewd in 23 joints of 21 patients hetween May 1992 and June 1996. The results were as follows: 1. Pain, tenderness, swelling, ROM of synovitis syrnpknns were much nsiproved postoperatively. 2. The degrees of articular cartilage damage were closely related to posto-perative functional recovery. 3. Preoperative and postoperative ESR changes were not ditferent signihcantly, 4. Recurrence rate was 17%, 4 cases. Of them, 2 cases were rheumatoid arthritis, 1 case was pigmented villonodular synovitis, I case was nonspecipic synovitis 5. Complicatior of arthrosc:opic synovectomy was nol found. We concluded that arthroscopic synovectoiny was very useful method of early diagnosis and treatment of synovial memhrane diseases.
Arthritis, Rheumatoid ; Arthroscopy ; Cartilage, Articular ; Early Diagnosis ; Humans ; Joints ; Knee Joint* ; Knee* ; Recurrence ; Synovitis ; Synovitis, Pigmented Villonodular