Radiographs of the right knee revealed an increase in density in the infrapatellar fat pad (Hoffa’s fat pad). Sagittal T1-weighted MRI showed hypointensity in the enlarged infrapatellar fat pad ...

MRI of the knee revealed a tumor arising from the Hoffa fat pad. The cause was a proliferative disorder of the synovial membrane (pigmented villonodular synovialitis, PVNS). Arthroscopy ...

The capsule, retinaculi and fat pad of Hoffa appeared normal. In the remaining three knees no pathology was found. On MRI two of the knees appearing normal on ultrasound showed either slight effusion ...