Popliteal cysts, also known as Baker cysts, are synovial lined cysts that form in the Popliteal region of the knee. <br>Patients may present with a pain or fullness in the posterior knee and will typically have symptoms of intra-articular pathology such as degenerative joint disease or meniscal tear. <br><br>Like meniscal cysts, popliteal cysts develop secondarily via extravasation of joint fluid. <br>These cysts typically can be easily identified on MRI because the classic cyst will demonstrate low T1 and high T2 signal with communication of joint fluid with the semimembranosus-gastrocnemius bursa. <br><br>Popliteal cysts can become quite large and are not always homogenous on MRI because of debris, loose bodies, or bleeding that can accumulate in the cyst. <br>The lining of the cyst will show enhancement on contrast MRI and can be quite thickened and septated because of inflammation. <br>In such cases with atypical MRI features, clear communication with the joint should be verified before the assumption of a popliteal cyst. <br>The primary treatment of the popliteal cysts requires management of the underlying intra-articular pathology. <br>Following appropriate management, popliteal cysts may resolve without excision. <br>For larger cysts that are causing symptoms in the popliteal fossa, excision through a posterior or of approach may be performed. ...
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