Onion peel sign
Citation, DOI, disclosures and article data
Citation:
Niknejad M, Silverstone L, Bell D, et al. Onion peel sign. Reference article, Radiopaedia.org (Accessed on 26 Mar 2025) https://doi.org/10.53347/rID-21007
rID:
21007
Article created:
Disclosures:
At the time the article was created Mohammad Taghi Niknejad had no recorded disclosures.
View Mohammad Taghi Niknejad's current disclosures
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
Revisions:
8 times, by
6 contributors -
see full revision history and disclosures
Systems:
Sections:
Synonyms:
- Cumbo sign
- Onion peel sign in pulmonary hydatid didease
- Double arch sign (hydatid)
The onion peel sign (also called the Cumbo sign or double arch sign) is pathognomonic for complete rupture of a pulmonary hydatid cyst. Gas enters both the pericyst and endocyst and gas-fluid levels may be present. The shrunken endocyst may mimic the appearance of onion peel.
History and etymology
It was first described by Cumbo in 1921 2.
References
- 1. Polat P, Kantarci M, Alper F et-al. Hydatid disease from head to toe. Radiographics. 2003;23 (2): 475-94. Radiographics (full text) - doi:10.1148/rg.232025704 - Pubmed citation
- 2. Benson CD, Evans WA, Zuelzer WW. Echinococcus cyst of lung exhibiting unusual radiologic and surgical features. Annals of surgery. 117 (2): 268-77. Pubmed
- 3. Durhan G, Tan A, Düzgün S, Akkaya S, Arıyürek O. Radiological Manifestations of Thoracic Hydatid Cysts: Pulmonary and Extrapulmonary Findings. Insights Imaging. 2020;11(1):116. doi:10.1186/s13244-020-00916-0 - Pubmed
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