Large lobulated homogenously and vividly enhancing high T2 and low T1 lesion (measuring about 7.8 x 9.0 x 6.2 cm) arising from the thickened left knee synovium extending superiorly, wrapping around the anterior part of the distal femur bone and inferiorly around the proximal tibia. This stretches the joint ligaments and encases the neurovascular bundle. There is bone invasion and cortical breach at the level of the knee joint with enhancement suggestive of osteomyelitis.
Surrounded by multi-focal loculated peripherally enhancing collections, one opening anterolaterally into the skin by sinus. The largest pocket measures 5.7 x 2.8 cm.