Arteria trigemina
Zufallsbefund
einer persistierenden A. trigemina, also einer Verbindung von der A. carotis interna zur A. basilaris, die normalerweise in der Embryonalzeit zurückgebildet wird. Hier finden sich weitere Anomalien: Die A. basilaris ist streckenweise nur sehr schwach ausgebildet. Die A. trigemina mündet nach Abgabe der Aa. cerebelli superiores in die gegenseitige A. cerebri posterior während die andere A. cerebri posterior von der A. communicans posterior gespeist wird. Der Pfeil zeigt auf die von rechts kommende A. trigemina. (Bilder aus einer T1-3D-KM-Serie als Volumenrendering)
Persistent
primitive trigeminal artery • Persistent trigeminal artery - Ganzer Fall bei Radiopaedia
Tau sign in
persistent trigeminal artery. Oblique VRT image showing the PTA and hypoplastic proximal basilar artery and vertebral arteries.
Tau sign in
persistent trigeminal artery. VRT coronal image showing hypoplastic proximal basilar artery and V4 segments of both vertebral arteries. PTA (Persistent Trigeminal Artery) seen as a connection between cavernous segment of left ICA and mid-basilar artery.
Tau sign in
persistent trigeminal artery. Anomalous artery arising from the presellar left ICA, running posteriorly through the left cavernous sinus taking a parasellar course and joining the mid-basilar artery through the surface of clivus.
Tau sign in
persistent trigeminal artery. MIP coronal image showing the hypoplastic proximal basilar artery and V4 segments of both vertebral arteries. PTA (persistent trigeminal artery) seen as a connection between the cavernous segment of the left ICA and mid-basilar artery.
Persistent
primitive trigeminal artery • Persistent primitive trigeminal artery- Saltzman type II - Ganzer Fall bei Radiopaedia
Persistent
primitive trigeminal artery • Persistent primitive trigeminal artery (Saltzman I) - Ganzer Fall bei Radiopaedia
Persistent
primitive trigeminal artery • Persistent trigeminal artery - Ganzer Fall bei Radiopaedia
Persistent
primitive trigeminal artery • Persistent primitive trigeminal artery - Ganzer Fall bei Radiopaedia
Persistent
primitive trigeminal artery • Persistent trigeminal artery - Saltzman type I - Ganzer Fall bei Radiopaedia
Persistent
primitive trigeminal artery • Persistent trigeminal artery - Ganzer Fall bei Radiopaedia
Zufallsbefund
einer persistierenden A. trigemina, also einer Verbindung von der A. carotis interna zur A. basilaris, die normalerweise in der Embryonalzeit zurückgebildet wird. Hier finden sich weitere Anomalien: Die A. basilaris ist streckenweise nur sehr schwach ausgebildet. Die A. trigemina mündet nach Abgabe der Aa. cerebelli superiores in die gegenseitige A. cerebri posterior während die andere A. cerebri posterior von der A. communicans posterior gespeist wird. Der Pfeil zeigt auf die A. trigemina von rechts kommend. (Bilder aus einer T1-3D-KM-Serie als 8mm-MIP )
Persistent
primitive trigeminal artery • Persistent trigeminal artery - Ganzer Fall bei Radiopaedia
Persistent
primitive trigeminal artery • Persistent trigeminal artery - Ganzer Fall bei Radiopaedia
Persistent
primitive trigeminal artery • Persistent trigeminal artery - Ganzer Fall bei Radiopaedia
Persistent
primitive trigeminal artery • Persistent trigeminal artery - Ganzer Fall bei Radiopaedia
Persistent
primitive trigeminal artery • Persistent primitive trigeminal artery - Ganzer Fall bei Radiopaedia
Trident sign
(persistent primitive trigeminal artery) • Trigeminal artery and basilar ectasia - Ganzer Fall bei Radiopaedia
Co-existence
of persistent primitive trigeminal artery and another primitive carotid-basilar anastomosis associated with segmental agenesis of the ipsilateral internal carotid artery: a case report. Magnetic resonance angiography. Stereoscopic images of 3D time-of-flight magnetic resonance angiography showing segmental agenesis of the right internal carotid artery (ICA). The ipsilateral primitive trigeminal artery supplies the distal segments of the ICA and the dysplastic ipsilateral vertebral artery (VA). The arrow indicates the VA union
Co-existence
of persistent primitive trigeminal artery and another primitive carotid-basilar anastomosis associated with segmental agenesis of the ipsilateral internal carotid artery: a case report. Magnetic resonance imaging. Axial T2-weighted magnetic resonance imaging showing the right primitive trigeminal artery, a flow void (arrow) coursing postero-laterally between the dorsum sella and the cisternal portion of the trigeminal nerve (arrowhead)
Common and
uncommon intracranial arterial anatomic variations in multi-detector computed tomography angiography (MDCTA). What radiologists should be aware of. CTA (VRT 3D reconstructions) shows a left-sided trigeminal artery joining the basilar artery. The basilar artery (which is relatively hypoplastic, proximal to the connection site) gives rise to the right PCA, while the left PCA arises from the ICA (foetal PCom) (Saltzman’s type II or Weon’s type 3) (annotations)
Persisitierende
Arteria trigemina links als Zufallsbefund in der CTA. Deutlicher Kalibersprung der A. basilaris an der Einmündung. Linkes Bild Volumen Rendering (Blick von dorsal auf den Clivus), rechts schräg koronare MIP.
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.
Persistent primitive trigeminal artery (PPTA) is one of the persistent carotid-vertebrobasilar anastomoses. It is present in 0.1-0.6% of cerebral angiograms and is usually unilateral.
In utero, the trigeminal artery supplies the basilar artery before the development of the posterior communicating and vertebral arteries. The PTA arises from the junction between petrous and cavernous ICA, and runs posterolaterally along the trigeminal nerve (41%), or crosses over or through the dorsum sellae (59%). Vertebral, posterior communicating and caudal basilar arteries are often hypoplastic.
There are 2 types of PTA:
- Saltzman type I: PTA supplies the distal vertebrobasilar arteries. The posterior communicating artery is absent and the caudal basilar is absent or hypoplastic with hypoplastic distal vertebral arteries.
- Saltzman type II: PTA supplies the superior cerebellar arteries with the posterior cerebral arteries supplied by the posterior communicating artery.
Radiographic features
CT angiography / MRI
A characteristic tau sign or trident sign is described as its appearance on sagittal CTA or MR images.
Related pathology
There is an association with intracranial aneurysms and vascular malformations.
See also
Siehe auch:
- Arteria vertebralis
- intrakranielle arterielle Gefäßanomalien
- Nervus trigeminus
- Arteria basilaris
- persistierende karotidobasiläre Anastomosen
- tau sign
- Klassifikation Arteria trigemina
- primitive arteries in the brain
- persistent carotid-vertebrobasilar anastomosis
und weiter:
Assoziationen und Differentialdiagnosen zu Arteria trigemina:
