Synovial chondromatosis is a cartilaginous metaplasia of the residual stroma of the synovial tissue of the joint. Its main characteristic is the formation of cartilaginous nodules in the synovium and in the joint space (loose bodies). It usually appears between the ages of 30 and 50 and is rare in children. It presents as a monoarticular lesion affecting large joints such as the knee, hip and elbow, and rarely the ankle. The main symptoms are pain, swelling and limited mobility in the affected joints. Diagnosis is based on X-rays, CT scans and magnetic resonance imaging. In this case report, we describe a pediatric patient with synovial chondromatosis of the ankle. We discuss the imaging features on radiography, CT and MRI, followed by a brief review of the literature.
