MRI:
- A multi-lobulated, well-defined, fluid signal intensity lesion is noted in the subcutaneous plane in the popliteal fossa of left knee.
- The lesion appeared heterogeneously hyperintense on T2W and PDFS images, with a T2W hypointense rim. It appeared hypointense on T1W images.
- No extension into the intermuscular plane or cutaneous breech.
- No involvement of underlying bony cortices, joint, synovial spaces, or knee joint ligament.
- It is seen abutting the muscle belies of gastrocnemius and semimembranosus.