Onion peel sign
Citation, DOI, disclosures and article data
At the time the article was created Mohammad Taghi Niknejad had no recorded disclosures.View Mohammad Taghi Niknejad's current disclosures
At the time the article was last revised Daniel J Bell had no recorded disclosures.View Daniel J Bell's current disclosures
The onion peel sign (also called the Cumbo sign or double arch sign) is a feature seen with complicated pulmonary hydatid cyst in which the gas lining between the endocyst and pericyst has the appearance of an onion peel. It is pathognomonic for a ruptured hydatid cyst.
History and etymology
It was first described by Cumbo in 1921 2.
- 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