Water lily sign (hydatid cyst)
Last revised by Yoshi Yu on 29 May 2024
Citation, DOI, disclosures and article data
Citation:
Gaillard F, Yu Y, Amer M, et al. Water lily sign (hydatid cyst). Reference article, Radiopaedia.org (Accessed on 06 Oct 2024) https://doi.org/10.53347/rID-2281
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rID:
2281
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Disclosures:
At the time the article was created Frank Gaillard had no recorded disclosures.
View Frank Gaillard's current disclosures
Last revised:
29 May 2024,
Yoshi Yu ◉
Disclosures:
At the time the article was last revised Yoshi Yu had no financial relationships to ineligible companies to disclose.
View Yoshi Yu's current disclosures
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29 times, by
20 contributors -
see full revision history and disclosures
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Synonyms:
- Water lilly sign
- Camalote sign
- Waterlily sign
- Water-lilly sign
- Water lily
The water lily sign, also known as the camalote sign, is seen in hydatid infections when the inner endocyst detaches from the outer pericyst, resulting in a free-floating membrane within the cyst.
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.
History and etymology
The water lily sign is termed for its resemblance to a water lily pad floating on water 5. Similarly, camalote is another name for the water hyacinth, a free-floating aquatic plant 6.
Quiz questions
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References
- 1. Kerimoglu U, Kapicioglu S, Emlik D et-al. Case 161: hydatid disease with water lily sign manifesting as a soft-tissue mass in the calf of a child. Radiology. 2010;256 (3): 1007-10. doi:10.1148/radiol.10081066 - Pubmed citation
- 2. Gwee A, Chinnappan M, Connell TG et-al. The Water Lily Sign. J. Pediatr. 2013;: . doi:10.1016/j.jpeds.2012.12.068 - Pubmed citation
- 3. Gezgin S, Sanal HT. "Water-lily sign" as a rare finding of spinal hydatidosis. Spine J. 2012;12 (6): e5-7. doi:10.1016/j.spinee.2012.05.013 - Pubmed citation
- 4. Kerimoglu U, Kapicioglu S, Emlik D et-al. Case 161: hydatid disease with water lily sign manifesting as a soft-tissue mass in the calf of a child. Radiology. 2010;256 (3): 1007-10. Radiology (full text) - doi:10.1148/radiol.10081066 - Pubmed citation
- 5. Pendse H, Nawale A, Deshpande S, Merchant S. Radiologic Features of Hydatid Disease. J of Ultrasound Medicine. 2015;34(5):895-905. doi:10.7863/ultra.34.5.895 - Pubmed
- 6. Sierra-Carmona C, Hernández-Orduña M, Murrieta-Galindo R. Alternative Uses of Water Hyacinth (Pontederia Crassipes) from a Sustainable Perspective: A Systematic Literature Review. Sustainability. 2022;14(7):3931. doi:10.3390/su14073931
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Articles:
Cases:
- Water lily (illustration)
- Ruptured pulmonary hydatid cyst
- Hydatid cyst - pulmonary
- Water lily sign - hepatic hydatid cysts
- Hepatic hydatid cyst
- Serpent (snake) sign
- Splenic hydatid cysts
- Hydatid disease, abdominal dissemination
- Pulmonary hydatid cyst with bronchial fistula
- Peritoneal hydatid cyst mimicking a neoplasm
- Hepatic hydatid cyst
- Hepatic hydatid cyst
- Rupture of massive pulmonary hydatid cyst with tension hydropneumothorax
- Calcified hepatic hydatid cyst
- Hepatic hydatid cyst - water lily sign
- Hepatic hydatid cyst
- Hepatic hydatid cysts
- Hydatid cyst within vastus lateralis muscle
- Simultaneous pulmonary and hepatic multiple hydatid cysts
- Complicated pulmonary hydatid cyst
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