Upper T sign

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The upper T sign is one of the features useful in identifying the central sulcus of the cerebral cortex on cross-sectional imaging.

It relies on identifying the superior frontal sulcus which intersects 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 lower T sign which represents the confluence of the inferior frontal sulcus with the precentral sulcus.

See also