Quad sign
Last revised by Daniel J Bell on 29 Jan 2018
Citation, DOI, disclosures and article data
Citation:
Venkatesh M, Bell D, Luijkx T, Quad sign. Reference article, Radiopaedia.org (Accessed on 29 Mar 2024) https://doi.org/10.53347/rID-30807
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rID:
30807
Article created:
4 Sep 2014,
Manchikanti Venkatesh
Disclosures:
At the time the article was created Manchikanti Venkatesh had no recorded disclosures.
View Manchikanti Venkatesh's current disclosures
Last revised:
29 Jan 2018,
Daniel J Bell ◉
Disclosures:
At the time the article was last revised Daniel J Bell had no recorded disclosures.
View Daniel J Bell's current disclosures
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3 times, by
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The quad sign is a static sonographic sign observed in pleural effusion. It consists of four lines representing the pleura, rib, fluid, and lung. Similar to the sinusoid sign, this sign has a high sensitivity and specificity for pleural effusion, which - when simple - is itself anechoic.
References
- 1.Lichtenstein DA, Mauriat P. Lung Ultrasound in the Critically Ill Neonate. Curr Pediatr Rev. 2012;8 (3): 217-223. doi:10.2174/157339612802139389 - Free text at pubmed - Pubmed citation