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 31 Mar 2023) https://doi.org/10.53347/rID-30807

DOI:

https://doi.org/10.53347/rID-30807

Permalink:

https://radiopaedia.org/articles/30807?iframe=true

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

Revisions:

6 times, by 3 contributors - see full revision history and disclosures

Systems:

Sections:

Tags:

pleural effusion, stub

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

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