Primary lipoma arborescens of the knee

Lipoma arborescens is a rare and benign intra-articular lesion of unknown etiology; it is characterized by synovial villous proliferation and sub-synovial connective tissue replacement by mature fatty tissue. It is part of the differential diagnosis in patients with an articulation affected by a slow, progressive, and chronically inflamed affection. We report primary knee involvement in a patient without significant articulate antecedents. Lipoma arborescens was diagnosed after knee magnetic resonance imaging and was confirmed by an anatomopathological study of the surgical specimen.

Cite this article as: Pinto de Souza T, Pinto Carneiro JB, Freire dos Reis M, Bellaguarda Batista B, Silva Gama FA, Euzébio Ribeiro SL. Primary lipoma arborescens of the knee. Eur J Rheumatol 2017; 4: 219-21.