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Fig. 1B. —23-year-old man with localized nodular synovitis involving infrapatellar fat pad who presented with pain and locking of right knee. Sagittal spin-echo T2-weighted MR image (2000/90) shows heterogeneous signal intensity in polylobulated lesion (arrow) that extends from infrapatellar fat pad to anterior aspect of intercondylar notch. Note small circular foci of low signal intensity and linear region of fluidlike high signal intensity in lesion.