Persistent carotid-vertebrobasilar anastomoses: cases of proatlantal artery Type I and Type II

• DOI: 10.2399/ana.18.032
• Publication Date: 2019-01-05T07:48:52Z
• Authors: Özhan Özgür; Güneş Aytaç; Muzaffer Sindel; Timur Sindel
• Keywords: 0301 basic medicine; 03 medical and health sciences; Health Care Administration; Sağlık Kurumları Yönetimi; angiography;carotid-vertebrobasilar anastomosis;persistent proatlantal artery

Persistent carotid-vertebrobasilar anastomoses occur as a result of discontinuation in the development vertebrobasilar system. [1][3][4] The primitive system comprises two parallel longitudinal neural arteries supplied by carotid with four major anastomoses. [5]In early stage embryonic life, these supply hindbrain.Blood flows here cerebral that directly connect and basilar arteries.These form named presegmental are adjacent cranial nerves: [1] trigeminal, otic, hypoglossal, proatlantal.Presegmental provide connection between internal artery, disappear after posterior communicating vertebral arteries.The one persists most frequently is trigeminal artery an incidence 0.2% angiograms.The other were found 0.1% birth. [6]Persistant proat-lantal (PPA) classified Type I II.Both types rare developmental anomalies; both originate from enter cranium through foramen magnum.Type originates ICA, takes dorsal course cephalad to transverse process C1, then travels rostral II proatlantal arises external (ECA) laterally, remains more lateral position than joins horizontal portion (VA) before entering magnum [1,7] (Figure 1).Type does not pass foraminae cervical vertebrae; contrast, passes C1 vertebra V3 VA. [1]We studied angiographies performed 2011-2015 at Department Radiology, School Medicine, Akadeniz