Interesting Cases

Our Radiologists

Please select from the list below:

Knee:  Focal Nodular Synovitis

47M w/ 5 years of pain.
Findings:  Focal mass along the anterior joint capsule, protruding into Hoffa’s fat.  Mixed, predominately low-intermediate signal intensity on fat-sat and non fat-sat images.  No other masses. 

This entity is thought to be a focal form of the more widespread synovial joint disease of pigmented villonodular synovitis (PVNS).  This is the classic location, usually less than 4cm.  PVNS involves the entire joint capsule surface with areas of bone erosion.  Blood products are broken down and hemosiderin is deposited within histiocytes, giving the low singal intensity areas that are enhanced using gradient echo MRI sequences.  The focal nodular form tends to have less hemosiderin deposited.  PVNS is treated by complete synovectomy, and because this is extrememly difficult to accomplish, the disease tends to recur.

See All Interesting Cases Below

Medical technology changes rapidly and although this website is frequently updated, some information may not be current. Diversified Radiology of Colorado, P. C. assumes no liability for any damages resulting from information contained on this site. If you have any questions regarding medical information on this site or any linked sites, we recommend you contact your primary care physician.


Diagnose This!


Check Out Our Latest 
Unknown Case

Have an Interesting Case to share? Submit it here.