Background and Objective: In normal development,
the aortic arch (AA) gives 3 major branches: 1)
Brachiocephalic trunk, 2) Left common carotid artery,
and 3) Left subclavian artery. The abnormality of those
AA branching is important for thoracic surgery
consideration. Although the abnormality of aortic
arch branching has been reported in some races, this
abnormality in Thai cadavers has never been
investigated previously.
Method: Dissections in this study were performed in
Thai embalmed cadavers during teaching gross
anatomy for Medical students of Ubon Ratchathani
university. The cadavers were carefully dissected
thoracic region to investigate the anatomical structures
of AA branching. This study was carried out from 10
female and 12 male cadavers. Result: From total 22 cadaveric samples, it was noted
that only one male cadaver (58 years old, 4.55% of
total investigated samples) has abnormality of the left
vertebral artery obviously projected from the AA by
running out between the left common carotid artery
and left subclavian artery.
Conclusion: The information of this rare variation in
the origin of vertebral artery from the AA is of the
most importance to surgeons performing surgery in
thoracic region. For radiologist, it is noted to avoid the
misinterpretation of radiographs during performing
angiography.