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T2 weighted magnetic resonance image of the left knee and popliteal fossa. The hyperintense lesion represents the Baker's cyst.
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The needle aspiration of the right knee joint was unproductive, and magnetic resonance imaging of the right knee and popliteal fossa was obtained and revealed a Baker's cyst(Figure 1).
Surgical specimen of Baker's cyst showing lobulated cystic lesion.
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At operation, a lobulated cystic lesion displacing neurovascular structures was released, but neurovascular invasion by a cyst was not found(Figure 2).
Biopsy specimen revealing a cyst with synovial lining which is compatible with Baker's cyst.
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The biopsy finding was compatible with Baker's cyst due to rheumatoid arthritis(Figure 3).