Monod sign (lungs)
Citation, DOI, disclosures and article data
Citation:
Gaillard F, Silverstone L, Niknejad M, et al. Monod sign (lungs). Reference article, Radiopaedia.org (Accessed on 07 Mar 2025) https://doi.org/10.53347/rID-1689
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1689
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Disclosures:
At the time the article was created Frank Gaillard had no recorded disclosures.
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Last revised:
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
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17 times, by
14 contributors -
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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
- 1. Roig J, Aguilar X, Maestre J, Domingo C, Morera J. Pulmonary mass and air meniscus sign in a 19-year-old man. Chest. 1991; 100(2): 562-3. doi:10.1378/chest.100.2.562 [pubmed citation]
- 2. Takahashi N, Kawashima A, Stroehlein KB, Oldham SA. Mycetoma of the lung in a cavity that developed from a gunshot wound. AJR Am J Roentgenol. 1999; 172(2): 369-71. AJR Am J Roentgenol [pubmed citation]
- 3. Thompson BH, Stanford W, Galvin JR, Kurihara Y. Varied radiologic appearances of pulmonary aspergillosis. Radiographics. 1995; 15(6): 1273-84. Radiographics [pubmed citation]
- 4. Imaging of pulmonary infections. editors, Nestor L. Müller, Tomás Franquet, Kyung Soo Lee; associate editor, C. Isabela S. Silva. Philadelphia : Lippincott Williams & Wilkins, c2007. ISBN: 078177232X
- 5. Abramson S. The air crescent sign. Radiology. 2001;218 (1): 230-2. doi:10.1148/radiology.218.1.r01ja19230 - Pubmed citation
- 6. PESLE GD, MONOD O. Bronchiectasis due to aspergilloma. (1954) Diseases of the chest. 25 (2): 172-83. doi:10.1378/chest.25.2.172 - Pubmed
- 7. Bankier A, MacMahon H, Colby T et al. Fleischner Society: Glossary of Terms for Thoracic Imaging. Radiology. 2024;310(2):e232558. doi:10.1148/radiol.232558 - Pubmed
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