Benign tumor like lesions involving the joints
What other benign tumor like lesions can involve the joints?
• Lipomas may occur within the joint capsule or synovium, but true intraarticular lesions are rare.
• Lipoma arborescens is a diffuse increase in subsynovial fat causing chronic effusions usually in the suprapatellar portion of the knee.
• Chondroma is an isolated mass of benign cartilage, usually in the knee.
• Hemangiomas are unusual intraarticular lesions that occur most frequently in the joints of children and young adults. The knee is the most common site. Recurrent hemarthrosis may occur. Diagnosis can be made by computed tomography, MRI, or angiography.
• Osteoid osteomas, when occurring within the joint, have less of the “classic” pattern of nocturnal pain relieved by nonsteroidal antiinflammatory drugs and tend to involute spontaneously after 5 to 10 years.