proatlantal artery
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 case of the origin of the occipital artery from the ICA (red arrow)
Proatlantal
artery • Type II proatlantal artery - Ganzer Fall bei Radiopaedia
The proatlantal artery is one of the persistent carotid-vertebrobasilar anastomoses, and can be subdivided into two types depending on its origin:
- type I: (~55%)
- also known as the proatlantal intersegmental artery
- arises from the internal carotid artery
- corresponds to the first segmental artery
- type II: (~40%)
- corresponds to the second segmental artery
- arises from the external carotid artery
- rarely (~5%) it arises from the common carotid artery
Irrespective of their origin, the artery passes through the foramen magnum and joins the vertebral artery. If large then the ipsilateral vertebral artery is small or absent.
Differential diagnosis
It can be easily confused for another persistent carotid-vertebrobasilar anastomosis, the persistent hypoglossal artery but a key differentiator is that proatantal arteries courses through the foramen magnum whereas the persistent hypoglossal artery courses through the hypoglossal canal .
See also
Siehe auch:
- Arteria carotis externa
- Arteria carotis interna
- Arteria vertebralis
- Arteria carotis communis
- persistierende karotidobasiläre Anastomosen
- Canalis nervi hypoglossi
- type 2 proatlantal artery
- type 1 proatlantal artery
und weiter:
Assoziationen und Differentialdiagnosen zu persistent proatalantal intersegmental artery:
