Both giant synovial osteochondroma and parosteal osteosarcoma are rare musculo-skeletal tumors, often localized in the vicinity of the knee. Misdiagnosis of a malignant bone tumor can entail fatal consequences. Etiology of giant synovial osteochondroma is widely unsolved but is believed to originate from synovial chondromatosis, a mostly benign metaplasia of the synovial membrane. Parosteal ost...

Two cases of synovial chondromatosis of the temporomandibular joint (TMJ) are presented, including correlation of CT and MR imaging characteristics with surgical and pathologic findings. The usefulness of CT and MR imaging in the diagnosis of TMJ disorders is discussed.

uncommon, benign condition characterized by multiple nodules of hyaline cartilage in the subsynovial layer of joints, tendons, or bursal cavities. Three times more common in men than in women,1 it is most commonly diagnosed between the third and fifth decades of life.2 The knee is involved in two thirds of reported adult cases, followed in frequency by the hip, elbow, shoulder, and wrist.2 Extr...

Synovial chondromatosis is a benign idiopathic metaplasia of the synovial membrane. It affects one in 100000 persons. It is 3 times more common in males, arising between 30 and 50 years of age and mainly affects large joints such as the knees (70%), hips (20%) and shoulders (19%). Its etiology is unknown, although it has been associated with chromosomal mutations (p21.3 and 12q13) that affect p...

A case of synovial chondromatosis originating from the synovium of the anterior cruciate ligament (ACL) resulting in a mechanical block to knee extension is reported. A 36-year-old man complained of a restricted range of left-knee motion and pain when walking. Plain roentgenograms showed normal appearance, however, magnetic resonance imaging showed intensity changes in the ACL. Arthroscopically...

Synovial chondromatosis of the ankle is rare and sparsely documented. Traditional surgical intervention is open loose body excision and synovectomy. Upon literature review, only two other cases were found to be managed arthroscopically. We report a case of synovial chondromatosis in a 54-year-old man leading to pain and limited range of motion of his ankle. This unique case of extensive nodule ...