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(a–c). The panel shows (a) sagittal T2-weighted (TR/TE = 4150/87), (b) PD (TR/TE = 4150/14) fat saturated and (c) sagittal T1-weighted (TR/TE = 495/12) MRI images. A sharply marginated mass is noted in the infrapatellar fat which follows similar marrow signal intensity as the adjoining bones. A smooth thin hypointense rim (white arrows) of cortex is noted on all sequences. A peripheral rim of cartilage (black arrows) is noted outside the cortex in the T2- and PD-weighted images.
