In a 50-year-old unresponsive man with ophthalmoplegia, bilateral thalamic
infarction was detected on magnetic resonance imaging of the brain, A thoro
ugh evaluation, including urinalysis, laboratory studies, computed tomograp
hy of the brain, chest radiography, lumbar puncture, magnetic resonance ang
iography, cerebral angiography, carotid ultrasonography, and transesophagea
l echocardiography, revealed no obvious predisposing factors other than het
erozygous factor V Leiden mutation. To our knowledge, this is the first rep
orted case of bilateral thalamic infarction associated with factor V Leiden
mutation, Physicians should consider the possibility of this mutation in p
atients with ischemic stroke if no other source is evident.