Lower T sign (central sulcus)
Citation, DOI, disclosures and article data
Citation:
Gaillard F, Hacking C, Murphy A, Lower T sign (central sulcus). Reference article, Radiopaedia.org (Accessed on 20 Mar 2025) https://doi.org/10.53347/rID-49411
Permalink:
rID:
49411
Article created:
Disclosures:
At the time the article was created Frank Gaillard had no recorded disclosures.
View Frank Gaillard's current disclosures
Last revised:
Disclosures:
At the time the article was last revised Henry Knipe had the following disclosures:
- Micro-X Ltd, Shareholder (past)
These were assessed during peer review and were determined to not be relevant to the changes that were made.
View Henry Knipe's current disclosures
Revisions:
4 times, by
4 contributors -
see full revision history and disclosures
Systems:
The lower T sign can be useful in identifying the central sulcus on cross-sectional imaging. It relies on identifying the inferior frontal sulcus, which intersects with the precentral sulcus in a "T" junction, thus defining the precentral gyrus. The central sulcus is the next posterior sulcus.
It should be distinguished from the upper T sign, which is the confluence of the superior frontal sulcus with the precentral sulcus.
References
- 1. Wagner M, Jurcoane A, Hattingen E. The U Sign: Tenth Landmark to the Central Region on Brain Surface Reformatted MR Imaging. AJNR Am J Neuroradiol. 2013;34(2):323-6. doi:10.3174/ajnr.A3205 - Pubmed
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