We present a case of a patient with lipoma arborescens who was treated using an arthroscopic procedure. Lipoma arborescens is an uncommon pseudo-tumoural synovial lesion that usually develops in the suprapatellar pouch of the knee. Magnetic resonance imaging helped to confirm the lipomatous nature of the synovial proliferation. Arthroscopic synovectomy can be performed when lipoma arborescens is confined to the anterior knee compartment.