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Surgical and Radiologic Anatomy

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01-10-2012 | Anatomic Variations

Type 2 proatlantal intersegmental artery associated with persistent trigeminal artery diagnosed by MR angiography

Authors: Akira Uchino, Naoko Saito, Kaiji Inoue

Published in: Surgical and Radiologic Anatomy | Issue 8/2012

Abstract

Purpose

The type 2 proatlantal intersegmental artery (PIA) is a rare anastomosis between the external carotid artery (ECA) and vertebral artery (VA) that passes through the foramen magnum. The persistent trigeminal artery (TA) is the most common anastomosis between the internal carotid artery (ICA) and basilar artery. The purpose of this paper is to present the first case of a type 2 PIA associated with an ipsilateral persistent TA diagnosed using magnetic resonance (MR) angiography, and we briefly discuss the embryology of this rare anomaly.

Methods

An 83-year-old man with cerebral infarctions underwent cerebral MR imaging, and head and neck MR angiography using a 1.5 T imager. MR angiography was obtained using the standard non-contrast three-dimensional time-of-flight technique.

Results

MR angiography showed aplasia of the proximal left VA and a large anastomotic artery between the left ECA and distal left VA that passed through the foramen magnum, indicative of a type 2 PIA. This patient also had an anastomosis between the precavernous segment of the left ICA and midbasilar artery via a lateral course, indicative of a lateral-type persistent TA.

Conclusion

We present the first case of type 2 PIA associated with ipsilateral lateral-type persistent TA diagnosed by MR angiography. MR angiography should be performed including the carotid bifurcation to find more frequently extracranial arterial variations, including type 2 PIAs.

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Title: Type 2 proatlantal intersegmental artery associated with persistent trigeminal artery diagnosed by MR angiography
Authors: Akira Uchino
Naoko Saito
Kaiji Inoue
Publication date: 01-10-2012
Publisher: Springer-Verlag
Published in: Surgical and Radiologic Anatomy / Issue 8/2012
Print ISSN: 0930-1038
Electronic ISSN: 1279-8517
DOI: https://doi.org/10.1007/s00276-011-0839-1

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

Type 2 proatlantal intersegmental artery associated with persistent trigeminal artery diagnosed by MR angiography

Abstract

Purpose

Methods

Results

Conclusion

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

Abstract

Purpose

Methods

Results

Conclusion

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