Water lily sign (hydatid cyst)

Last revised by Mohammad Salem Amer on 17 Feb 2024

The water lily sign, also known as the camalote sign, is seen in hydatid infections when there is detachment of the endocyst membrane which results in floating membranes within the pericyst that mimic the appearance of a water lily.

It is classically described on plain radiographs (mainly chest X-ray) when the collapsed membranes are calcified but may be seen on ultrasound, CT, and MRI.

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