Water-lily sign AKA Camalote sign is a characteristic feature found on imaging in hydatid cyst. It is formed by detachment of endocyst membrane which floats within the cyst. Reference: https://radiopaedia.org/articles/water-lily-sign-hydatid-cyst#:~:text=The%20water%2Dlily%20sign%2C%20also,appearance%20of%20a%20water%20lily. Image via: https://radiopaedia.org/articles/water-lily-sign-hydatid-cyst