Middle age man with leg pain and swelling



Doctor's Information

Name : Morteza
Family :Sanei Taheri
Affiliation :Radiology Department,Shohada Tajrish Hospital,SBMU
Academic Degree: Associate Professor of Radiology
Email : This email address is being protected from spambots. You need JavaScript enabled to view it.
Resident : Mani Armand


Patient's Information

Gender : Male
Age : 28


Case Section

Muskuloskeletal System


Clinical Summary

Middle age man with leg pain and swelling


Imaging Procedures and Findings

There is a cystic lesion in popliteal fossa (bakerâ??s cyst) with extension towards leg. There are some amount of fluid attenuation in intermuscular compartments due to cyst complication and leak. Subcutaneous edema is visible.



Synovial cysts are juxta-articular fluid collections lined by synovial cells. They are best conceptualized as focal extensions of the joint capsule that may or may not demonstrate continuity with the joint space. The most commonly encountered synovial cyst of the knee is the popliteal (or Baker) cyst, a fluid-filled cavity positioned within the posteromedial soft tissues of the knee. This cyst arises as an extension of knee joint fluid into the normally occurring gastrocnemius-semimembranosus bursa. MRl demonstrates a posteromedial fluid collection with a neck positioned between the medial head of the gastrocnemius and the semimembranosus tendon. Visible continuity with the joint space mayor may not be identifiable. In nearly all cases, a joint effusion is present owing to the presence of underlying internal derangement or degeneration. Most likely, the popliteal cyst arises as a sequela of primary knee joint pathology. Rupture is suggested when fluid extends beyond the bursal walls and tracks between fascial layers.


Final Diagnosis

Ruptured Bakers cyst



CT and MRI of the Whole body. John R. Haaga. Volume2


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