Abstract
Background: A 35-year-old man presented with a progressive painless swelling in the right knee. Medical history mentioned an arthroscopic partial medial meniscectomy. There was no recent trauma nor fever.
Highlights
A 35-year-old man presented with a progressive painless swelling in the right knee
Intra-articularly, a fatty mass is suspected with distension of the joint capsule and suprapatellar pouch
Some degenerative abnormalities are seen in the medial compartment of the knee
Summary
A 35-year-old man presented with a progressive painless swelling in the right knee. Medical history mentioned an arthroscopic partial medial meniscectomy. Groene Hart Ziekenhuis, Gouda, Utrecht, The Netherlands. Plain radiograph of the right knee (Fig. 1) includes an antero-posterior view (A) and a lateral view (B) on which no bony abnormalities are visible. There is a slight narrowing of the medial joint space. Intra-articularly, a fatty mass is suspected with distension of the joint capsule and suprapatellar pouch. MRI of the right knee (Fig. 2) consisted of a sagittal unenhanced T1W image (A), a coronal T2W fat saturation image (B), a sagittal fat saturation image (C) and a coronal fat saturation image (D). A large frond-like, intra-articular fatty mass of synovial origin is visible. There is distension of the joint capsule, including the supra-patellar pouch. Some degenerative abnormalities are seen in the medial compartment of the knee. Saturation of the synovial mass is visible when the fat saturation technique is used
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