Ball of wool sign (hydatid cyst)
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At the time the article was created Mohammed Al Khader.O.Thabet had no recorded disclosures.View Mohammed Al Khader.O.Thabet's current disclosures
At the time the article was last revised Ayla Al Kabbani had no recorded disclosures.View Ayla Al Kabbani's current disclosures
The ball of wool sign, also referred to as the yarn sign or congealed water lily sign, is an ultrasound appearance, representing degeneration of hydatid cysts (WHO class CE 4). The inner side of the cyst detaches from the cyst wall and folds on itself, causing a change from anechoic (fluid) to a solid, hyperechoic appearance without internal septations or daughter cysts 4.
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