11B – T1-weighted (11a) and fat-suppressed proton density-weighted (11b) sagittal images from a 58-year-old male with chronic anterior knee pain and swelling. Bulky heterogeneous enlargement of the proximal patellar tendon is present due to an infiltrating process (arrowheads), and there is extension into the caudal aspect of the patella (arrows). Gout was diagnosed at surgery.