A 43-year-old corrections officer developed right neck and posterior h
ead pain following a karate punch to the right side of the neck during
self-defense training, One week later, he developed an acute left hem
iparesis. Magnetic resonance imaging demonstrated a right hemisphere c
erebral infarction and absence of signal flow void in the right intern
al carotid artery, Carotid ultrasound demonstrated complete occlusion
of the right internal carotid artery without evidence of atherosclerot
ic disease, Carotid occlusion with cerebrovascular infarction is a pos
sible complication of martial arts training involving forceful blows t
o the neck.