Bow Hunter's syndrome is extremely rare, which is mainly caused by mechanical 
vertebral artery occlusion or stenosis during head and neck rotation or 
hyperextension. Herein, we describe the case of a 19-year-old man without a 
history of trauma who presented with dizziness, binocular blackness, and 
disturbance of consciousness after looking up when cleaning the classroom. 
Subsequent imaging findings revealed the blood flow of the C2 segment of the 
contralateral vertebral artery was interrupted when the patient turned his head 
to 1 side. Such patients with normal CT angiography of the head and neck scan 
will show that the head and neck blood vessels are normal, which will affect the 
prognosis of patients. This case highlights the importance and implications of 
dynamic CT angiography of the head and neck in the diagnosis of Bow Hunter's 
syndrome.