Water-lily sign shown
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In left lobe of the liver, a well – defined cystic mass with a “floating membrane” within the cavity. The “floating membrane” represents the complete detachment of the endocyst – Laminated membrane from the pericyst and is referred as “Water-Lily” sign.
This ultrasonographic sign is pathognomonic for Echinococcosis Hydatid Cyst in the Transitional stage (WHO CE3) . Note the multiple echogenic foci (yellow arrows) due to hydatid 'sand'.