Multiple choice

Floating water- lilly sign on X ray chest

  1. hydatis dis of liver

  2. asperigilosis

  3. tubercular cavity

  4. None of these
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A Correct answer
Explanation

The water-lily sign (or water-lilly sign) is classically seen in hydatid disease of the liver caused by Echinococcus granulosus. When a hydatid cyst partially ruptures, the endocyst membrane detaches and floats within the pericyst fluid, creating an appearance resembling a water lily on imaging. While typically seen on ultrasound or CT of the liver, it can be visible on chest X-ray if the cyst is large enough in the superior liver segments. Aspergillosis and tubercular cavities have different radiological patterns.

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