Apple core sign (colon)

Last revised by Frank Gaillard ◉ ◈ on 11 Feb 2025

Citation, DOI, disclosures and article data

Citation:

Niknejad M, Bell D, Hacking C, et al. Apple core sign (colon). Reference article, Radiopaedia.org (Accessed on 21 Mar 2025) https://doi.org/10.53347/rID-21967

DOI:

https://doi.org/10.53347/rID-21967

Permalink:

https://radiopaedia.org/articles/21967?embed_domain=hackmd.io%2525252525252F%25252525252540yipuafecsl2jsu8smr5njq%2525252525252Fbnjhjgjghjghjghfavicon.ico

rID:

21967

Article created:

1 Mar 2013, Mohammad Taghi Niknejad ◉

Disclosures:

At the time the article was created Mohammad Taghi Niknejad had no recorded disclosures.

View Mohammad Taghi Niknejad's current disclosures

Last revised:

11 Feb 2025, Frank Gaillard ◉ ◈

Disclosures:

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

View Frank Gaillard's current disclosures

Revisions:

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

Systems:

Gastrointestinal, Oncology

Sections:

Signs, Gamuts

Synonyms:

Napkin ring sign (colon)
Apple core lesion
Apple core sign of the colon
Apple core appearance of the colon
Apple core sign

The apple core sign, also known as the napkin ring sign (bowel), is most frequently associated with constriction of the lumen of the colon by a stenosing annular colorectal carcinoma.

It is not to be confused with the napkin ring sign of vulnerable coronary artery plaque or the apple core sign of the femur.