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Fig. 4B —44-year-old man with painful mass that popped out over his
lateral knee with flexion and disappeared with extension. MRI of knee,
obtained with knee in extension, failed to find cause of his symptoms.
Longitudinal sonogram obtained at lateral aspect of distal femur with knee in
flexion reveals approximately 1.5-cm soft-tissue mass (M) consistent with fat
that abruptly popped into lateral recess of joint, accompanied by pain. At
surgery, this mass was shown to be intraarticular fat that was tethered by a
plica (arrow).
