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Fig. 2A. —60-year-old woman with Baker's cyst. Axial sonogram of posterior knee shows Baker's cyst (arrowheads) with fluid (solid straight arrow) between semimembranosus tendon (curved arrow) and medial gastrocnemius tendon (open arrow). Note subgastrocnemius component (asterisk) of Baker's cyst. Note that top of image is posterior; right side of image is medial. M = medial gastrocnemius muscle.