Speech bubble sign
Presented with a painless lump in the posterior side of the left knee for the last few months.
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There is a well-defined, anechoic, avascular lesion (59 x 37 x 16 mm) on the posteromedial side of the left knee. The lesion shows a neck going in the deeper plane between the medial head of the gastrocnemius and the semimembranosus tendon. There are few tiny echoes in the lesion. There is no leak from the lesion. Overlying subcutaneous fat shows a normal echopattern.