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Anomalous arch of aorta giving rise to left vertebral artery

Authors:Jaideo M Ughade, Poorwa B Kardile, Manohar N Ughade, Prashant N Chaware, Sudhir V Pandit, Umesh S Joge
Int J Biol Med Res. 2012; 3(4): 2452-2454  |  PDF File


It is important to know the variations in the great arteries arising from the arch of aorta. Normally three arteries arise from the arch of aorta, brachiocephalic trunk, left common carotid and left subclavian artery. During our study of branching pattern of arch of aorta, we encountered arch of aorta giving rise to four branches. Along with routine branches, arch of aorta was giving rise to left vertebral artery. This variation is important because vertebral artery forms important part of posterior cerebral circulation. The anomalous left vertebral artery arising from arch of aorta, coursed upward to the transverse foramen of the C6 vertebra. The diameter at its origin was 4.2 mm. Existence of this variation can be explained on the basis of embryological development. The anatomical and morphological variations of the left vertebral artery are significant for diagnostic and surgical procedures in the head and neck region. It is clinically important to know the origin and course of prevertebral segment of the vertebral artery in detail and be aware of possible variations.