• Medial Collateral ligament MCL BURSA. The MCL bursa lies between the superficial MCL and the capsule and deep MCL.

• Whilst it's present anatomically, usually its not seen on MRI and fluid is seen when there is bursitis.

• In this case it extends deep to the femoral and tibial component of the sMCL however it can be limited to just one section.

Fluid (Orange arrow) present deep to the superficial MCL (Blue arrow).