From the case:
Ball of wool (illustration)
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Illustration of a ball of wool.
Image generated with Bing.com by Lachlan McKay.
Case Discussion
The ball of wool sign describes the sonographic appearance of a degenerating hydatid cyst 1. It is thought to be caused by the separation of the germinal layer from the cyst wall and subsequent folding of the cyst into layers 1.
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