Lipoma arborescens with patellofemoral osteoarthritis and genu valgum.

Lipoma arborescens is a rare benign intra articular lesion characterized by lipomatous proliferation of the synovium. The condition typically affects the knee presenting with atraumatic pain and swelling. It should be considered in the differential diagnosis of monoarthritis and joint effusion. Diagnosis is made on MRI with characteristic features. We present a rare case of lipoma arborescens with patellofemoral osteoarthritis and genu valgum. We discuss the clinical presentation, radiological findings, and management.