Jul 11, 2024 · A characteristic tau sign 4 or trident sign is described as its appearance on sagittal CTA or MRA/MRI. There is an association with intracranial aneurysms and vascular …

Mar 5, 2025 · The tau sign represents the appearance of a persistent primitive trigeminal artery on the sagittal plane of an angiogram or on sagittal MRI. It resembles the Greek letter τ , …

Nov 13, 2020 · Persistent Trigeminal Artery (PTA), Tau sign Persistent Primitive Trigeminal Artery is one of the persistent carotid-vertebro-basilar anastomoses. PTA arises from petrous …

The “Tau” sign is a frequently cited sign on MR imaging and refers to the appearance of a presellar internal carotid artery (ICA) when a persistent trigeminal artery arises from it on a …

Post-processing on the VITREA software (D) demonstrated the persistent primitive trigeminal artery (white arrow) arising just proximal to the aneurysm. The horizontal and vertical portions …

The tau sign resembles the Greek letter “τ”. It represents the appearance of a persistent primitive trigeminal artery (PPTA) on sagittal plane of MRI or angiography. PPTA is one of the …

Sep 29, 2016 · A classic finding indicative of PTA on sagittal MR images is the “Tau” sign due to its resemblance with the Greek letter “Tau” [3, 5]. The vertical limb and anterior horizontal …

May 20, 2024 · Tau sign- On sagittal images, the combination of the vertical and horizontal segments of the ICA and the proximal portion of the trigeminal artery resembles the greek …

In the majority of cases, persistent trigeminal artery is an incidental finding; however, it is often implicated as a rare cause of various neurological symptoms like headache, tinnitus, ataxia or …

Sep 8, 2011 · 'The tau sign' the configuration resembling the Greek letter 'T' formed by the joining of the proximal portion of the trigeminal artery to presellar portion of ICA as it turns from a …