tau sign
Tau sign in
persistent trigeminal artery. MRA TOF representing the greek letter "TAU" . Anterior horizontal limb and vertical limbs (orange colour) are formed by the ICA and the posterior limb (blue colour) is formed by the proximal part of PTA.
The tau sign represents the appearance of a persistent primitive trigeminal artery on the sagittal plane of an angiogram or on sagittal MRI images. It resembles the Greek letter τ, pronounced 'tau', and is equivalent to the modern day 'T' in the Latin alphabet.
The persistent trigeminal artery arises from the junction between the petrous and cavernous ICA and runs posterolaterally along the trigeminal nerve through, or adjacent to, the cavernous sinus.
Siehe auch:
Assoziationen und Differentialdiagnosen zu tau sign: