Grade* | Description of injury |
I | Thyroid vein |
Common facial vein | |
External jugular vein | |
Non-named arterial/venous branches | |
II | External carotid arterial branches (ascending pharyngeal, superior thyroid, Ingual, facial maxillary, occipital, posterior auricular) |
Thyrocervical trunk or primary branches | |
Internal jugular vein | |
External carotid artery | |
III | Subclavian vein |
Vertebral artery | |
Common carotid artery | |
IV | Subclavian artery |
Internal carotid artery (extracranial) | |
V |
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