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Monod sign (lungs)

Last revised by Liz Silverstone on 6 Mar 2024

Citation, DOI, disclosures and article data

Citation:

Gaillard F, Silverstone L, Niknejad M, et al. Monod sign (lungs). Reference article, Radiopaedia.org (Accessed on 06 Oct 2024) https://doi.org/10.53347/rID-1689

DOI:

https://doi.org/10.53347/rID-1689

Permalink:

https://radiopaedia.org/articles/1689

rID:

1689

Article created:

2 May 2008, Frank Gaillard ◉ ◈

Disclosures:

At the time the article was created Frank Gaillard had no recorded disclosures.

View Frank Gaillard's current disclosures

Last revised:

6 Mar 2024, Liz Silverstone ◉ ◈

Disclosures:

At the time the article was last revised Liz Silverstone had no financial relationships to ineligible companies to disclose.

View Liz Silverstone's current disclosures

Revisions:

17 times, by 14 contributors - see full revision history and disclosures

Systems:

Chest

Sections:

Signs

Tags:

lung

Synonyms:

Monod's sign
Monad sign

The Monod sign describes gas that surrounds a mobile fungus ball or mycetoma (most commonly an aspergilloma) in a pre-existing pulmonary cavity ^1-3.

Terminology

In the 2024 edition of the Fleischner glossary, air crescent is the preferred term applying to air crescents seen with both mobile intra-cavitary fungus balls and retracted infarcted lung (usually fixed in position), as seen in recovering angioinvasive aspergillosis ⁴.

History and etymology

The sign was first described by the French physicians G D Pesle and Olivier Monod in 1954 ⁶.

References

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