Swelling on the back of one knee may be a Baker's cyst. A Baker's cyst can form when joint-lubricating fluid fills a cushioning pouch bursa at the back of your knee. A Baker's cyst is a fluid-filled cyst that causes a bulge and a feeling of tightness behind your knee. The pain can get worse when you fully flex or extend your knee or when you're active.

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Baker cysts , or popliteal cysts , are fluid-filled distended synovial-lined lesions arising in the popliteal fossa between the medial head of the gastrocnemius and the semimembranosus tendons via a communication with the knee joint.

They are usually located at or below the joint line. They represent neither a true bursa nor a true cyst, as they occur as a communication between the posterior joint capsule and the gastrocnemius-semimembranosus bursa. Symptomatic presentation may be acute when rupture occurs, in which case the chief differential diagnosis is deep venous thrombosis. Exquisitely outlines the cyst as a mass extending from the joint space with high T2 signal content.

In children, they can be common, with most spontaneously resolving within months. Aspiration may be performed, with steroid injection shown to be beneficial in reducing Baker cyst size and improving symptoms 5,6, The knee is a complex synovial joint that can be affected by a range of pathologies:.

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Once your system installs this update, you will not be able to upload new images. Please use another browser until we can get it fixed. On this page:. Sonographic detection of Baker's cysts: comparison with MR imaging. MR imaging of Baker cysts: association with internal derangement, effusion, and degenerative arthropathy. Radiology abstract - Pubmed citation 3. Baker's cyst imaging. Int J Emerg Med. Int J Emerg Med full text - doi Sonography of the painful calf: differential considerations.

Ultrasound guided percutaneous treatment and follow-up of Baker's cyst in knee osteoarthritis. Eur J Radiol. Longitudinal ultrasound and clinical follow-up of Baker's cysts injection with steroids in knee osteoarthritis. Handy JR. Popliteal cysts in adults: a review. Arthritis Rheum. Baker WM. On the formation of synovial cysts in the leg in connection with disease of the knee-joint.

Pubmed citation 9. Proximal dissection and rupture of a popliteal cyst: a case report. Case Rep Radiol. Sports Health. Musculoskeletal Imaging. OUP Oxford. Read it at Google Books - Find it at Amazon. Edit article Share article View revision history Report problem with Article. URL of Article. Article information. System: Musculoskeletal.

Support Radiopaedia and see fewer ads. Cases and figures. Case 1 Case 1. Case 2 Case 2. Case 3 Case 3. Case 4: ruptured popliteal cyst Case 4: ruptured popliteal cyst. Case 5: rupture baker cyst Case 5: rupture baker cyst.

Case 6: Baker cyst aspiration Case 6: Baker cyst aspiration. Case 7: with rupture Case 7: with rupture.

Case 8: with loose bodies Case 8: with loose bodies. Case 9: calcified loose bodies in a Baker cyst Case 9: calcified loose bodies in a Baker cyst. Case leaked Baker cyst Case leaked Baker cyst. Case 11 Case Loading more images Close Please Note: You can also scroll through stacks with your mouse wheel or the keyboard arrow keys. Loading Stack - 0 images remaining. By System:.

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Baker's Cyst

A Baker's cyst , also known as a popliteal cyst , is a type of fluid collection behind the knee. Risk factors include other knee problems such as osteoarthritis , meniscal tears , or rheumatoid arthritis. Treatment is initially with supportive care. Symptoms may include swelling behind the knee, stiffness, and pain. In adults, Baker's cysts usually arise from almost any form of knee arthritis e.


Baker's cyst


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