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Lipoma arborescens: 59-year-old female with chronic left knee pain. Frontal (a) and lateral (b) radiographs demonstrate tricompartamental osteoarthrosis with fullness of the suprapatellar recess. Axial (c) and sagittal (d) non-contrast CT images reveal a suprapatellar joint effusion with internal small, lobulated masses of fat-attenuation.
