Blade of grass sign (Paget disease)

Last revised by Frank Gaillard ◉ ◈ on 11 Feb 2025

Citation, DOI, disclosures and article data

Citation:

a, Collins E, Elfeky M, et al. Blade of grass sign (Paget disease). Reference article, Radiopaedia.org (Accessed on 23 Mar 2025) https://radiopaedia.org/articles/3820

DOI:

Permalink:

https://radiopaedia.org/articles/3820?embed_domain=buyreviewer.com%2Fbest-tire-inflator-on-amazon

rID:

3820

Article created:

17 Jun 2008, almehdi

Disclosures:

At the time the article was created almehdi had no recorded disclosures.

View almehdi'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:

15 times, by 13 contributors - see full revision history and disclosures

Systems:

Musculoskeletal

Sections:

Signs

Synonyms:

Candle flame appearance (Paget disease)
Blade of grass sign (Paget disease)
Flame sign (Paget disease)
Candle flame sign (Paget disease)
Blade of grass appearance (Paget disease)

The blade of grass sign, also called the candle flame sign, refers to the lucent leading edge in a long bone seen during the lytic phase of Paget disease of bone.

The blade of grass sign is characteristic of Paget disease of bone. This is akin to osteoporosis circumscripta cranii seen in the skull. A potential pitfall is misdiagnosing the track sign of the femur as the blade of grass sign.