From the case:
Ball of wool (illustration)
Download
Info
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.
Unable to process the form. Check for errors and try again.