Weichteilchondrom

Hoffa’s fat

pad abnormalities, knee pain and magnetic resonance imaging in daily practice. Extraskeletal chondroma, Sagittal proton density with fat saturation image shows a heterogeneous mass within the fat pad, with high signal of chondroid matrix and oedema and low signal of calcification or ossification (courtesy of Dr. L. Pietrobono, IRCCS Policlinico San Matteo, Pavia)

MRI imaging

of soft tissue tumours of the foot and ankle. Soft tissue chondroma. Axial T1W (a) and T2FS (b) images of the ankle with a large well-defined posteromedial mass (arrows) which appears T1 hypointense and T2 hyperintense with internal low signal chondroid foci (arrowheads). The chondroid matrix is readily appreciated on the corresponding radiograph (c)