Fig. 5From: Atlantoaxial dislocation with congenital “sandwich fusion” in the craniovertebral junction: a retrospective case series of 70 patientsAnomaly of vertebral arteries on CTA. a, b and c: the left lateral, left posterior oblique and posterior view of the VA; the blue arrow showed left VA was tortuous and anomalous riding under the C1 arch. d,e&f: the right lateral view of the VA; the vacant arrow showed right VA was also tortuous under the C1 archBack to article page