“…Apart from the five patients described by Hallel et al 10 all have been the subject of single case reports, 1,[3][4][5][6][7][8][9][12][13][14] some of which lacked pathological confirmation and clinical follow-up. 1,4,6,8,9,[11][12][13] Although Placeo and Tassi 18 presented a large series of cases and suggested a traumatic origin for this lesion, their series has not been accepted as lipoma arborescens because it showed reactive synovial hyperplasia overlying normal deposits of fat. 10,11 Patients with lipoma arborescens usually have longstanding, slowly progressive swelling of the involved joint, which may be associated with effusion, decreased range of movement and pain.…”