CASE REPORTS PRIKAZI SLUČAJEVA

Summary Introduction. Synovial chondromatosis is a benign disease of synovial membrane usually affecting knee, elbow and shoulder joints. It rarely appears as a solitary formation and exceptionally within Hoffa's fat pad. Case Report. We report a case of solitary synovial chondromatosis within Hoffa's fat pad as a cause of its impingement in a female patient aged 63. At first, the patient had anterior knee pain with limited extension of the knee. Standard radiogram showed only mild patellofemoral osteoarthritic chang- es. Magnetic resonance of the knee showed ovoid solitary forma- tion within Hoffa's fat pad repressing its superior part between the kneecap and distal femur. Histopathological examination con- firmed a case of extra-articular synovial chondromatosis. The tu- morous mass was extracted surgically en bloc. Conclusion. Soli- tary synovial chondromatosis is an uncommon cause of Hoffa's fat pad impingement and anterior knee pain in elderly female pa- tients and can easily be misinterpreted as a different diagnosis.