Cases reported "Popliteal Cyst"

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1/4. Cystic adventitial disease of the popliteal artery: elongation into the media of the popliteal artery and communication with the knee joint capsule: report of a case.

    Cystic disease of the popliteal artery is a rare disorder in which most cases involve the formation of an adventitial cyst that disturbs the popliteal artery blood flow. We present herein the case of a patient presenting with popliteal artery occlusion due to compression by a cyst which formed at the media of the popliteal artery. The onset occurred during a baseball game in which he played catcher. Preoperative magnetic resonance imaging demonstrated a communication of the cyst with the adjacent knee joint. This unusual case could provide important clues to help identify the pathogenesis of this disease.
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2/4. Two cases of tibial nerve compression caused by uncommon popliteal cysts.

    We report 2 cases of a popliteal mass of very unusual origin that induced compression neuropathy. The signs and symptoms could have been mistaken for those of a common Baker's cyst. Several recent studies have shown that the cause of Baker's cyst formation should be sought within the joint because of a communication between the gastrocnemio-semimembranosus bursa and the joint cavity. These 2 cysts had no communication with the articular joint, thus suggesting that the surgeon perform an open exploration of the popliteal fossa in the search for other cystic formations with origins and features different from Baker's cysts.
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3/4. Dissecting a popliteal cyst after failed unicompartmental knee arthroplasty.

    This report documents the first case of a popliteal cyst in a knee with failed unicompartmental knee arthroplasty (UKA). The cyst was treated successfully with the creation of a small communication hole between the posteromedial compartment and the popliteal cyst under direct arthroscopic visualization. This was followed by the replacement of a worn polyethylene insert via a small arthrotomy. Three months later, the popliteal mass had disappeared. This case suggests that a dissecting popliteal cyst may occur after UKA as one of the signs of a malfunction. It also suggests that treatment should be directed toward the joint and not the cyst itself.
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4/4. Gigantic popliteal synovial cyst caused by wear particles after total knee arthroplasty.

    We present a case exhibiting persistent joint effusion and formation of a gigantic popliteal synovial cyst 8 years after total knee joint arthroplasty. Assessment using flow cytometry revealed that both joint and cyst fluid contained abundant macrophage-phagocytosing wear particles. This finding indicates that wear particles participated in formation of the cyst through the communication between the joint cavity and cyst. Intraoperatively, prominent villous synovial proliferation was observed in both the joint and cyst, and delamination failure of the polyethylene insert was identified. Because no evidence of prosthetic loosening was found, only polyethylene insert revision and synovectomy were undertaken, resulting in a successful outcome. This case suggests that synovial cyst formation in popliteal lesions might represent a sign of wear-particle generation after total knee joint arthroplasty.
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