P sign

Last revised by Daniel J Bell on 2 Apr 2021

Citation, DOI, disclosures and article data

Citation:

Bell D, P sign. Reference article, Radiopaedia.org (Accessed on 23 Apr 2024) https://doi.org/10.53347/rID-88297

DOI:

https://doi.org/10.53347/rID-88297

Permalink:

https://radiopaedia.org/articles/88297

rID:

88297

Article created:

1 Apr 2021, Daniel J Bell ◉

Disclosures:

At the time the article was created Daniel J Bell had no recorded disclosures.

View Daniel J Bell's current disclosures

Last revised:

2 Apr 2021, Daniel J Bell ◉

Disclosures:

At the time the article was last revised Daniel J Bell had no recorded disclosures.

View Daniel J Bell's current disclosures

Revisions:

1 time, by 1 contributor - see full revision history and disclosures

Systems:

Head & Neck, Paediatrics

Sections:

Signs

Synonyms:

Alphabet P sign

The alphabet P sign, or just P sign, is a sonographic finding in acute epiglottitis. Using point of care ultrasound (POCUS), on a longitudinal view at the level of the thyrohyoid membrane, a P-shaped hypoechogenicity is apparent. The curved portion of the P is formed from the edematous epiglottis, whilst the straight part of the P is acoustic shadowing posterior to the hyoid bone.