HN	hypoglossal nerve
VA	vertebral artery
ICA	internal carotid artery
ECA	external carotid artery
IJG	internal jugular vein
C	cervical spinal nerve/cervical vertebra
OA	occipital artery
PICA	posterior inferior cerebellar artery
DAVF	dural arteriovenous fistula
LMA	laryngeal mask airway
TP	Tapia’s syndrome
CS	Collet–Sicard syndrome
OCF	occipital condyle fracture