Bow hunter's syndrome (BHS) is caused by transient vertebro-basilar ischemia on 
head rotation. We report a patient with BHS who was identified from dynamic 
changes to blood flow velocities in the posterior cerebral, basilar and 
vertebral arteries using carotid duplex ultrasonography and transcranial 
Doppler, simultaneously. Neurosonology appears to be useful for diagnosing and 
evaluating BHS.