Isolated trochlear palsy due to midbrain stroke.
Trochlear palsy from intra-axial lesions usually accompanies other neurological deficits, and isolated trochlear palsy due to midbrain stroke is extremely rare. We report two patients with isolated trochlear nerve palsy due to circumscribed dorsal midbrain strokes, one from infarction and the other from hemorrhage, which are located in the region of the trochlear nucleus or adjacent fascicle. Focal brain stem stroke should be considered as a rare cause of trochlear palsy even though there are no associated neurological deficits.
Department of Neurology, Chonnam National University Medical School, Republic of Korea.
Seung-Han
SH
Lee
Sang-Woo
SW
Park
Byeong C
BC
Kim
Myeong-Kyu
MK
Kim
Ki-Hyun
KH
Cho
Ji Soo
JS
Kim
D000368:Aged; D002543:Cerebral Hemorrhage / Q000150:complications*; D002544:Cerebral Infarction / Q000150:complications; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008636:Mesencephalon / Q000473:pathology; D008875:Middle Aged; D009460:Neurologic Examination; D010243:Paralysis / Q000209:etiology; D013285:Strabismus / Q000209:etiology; D020521:Stroke / Q000150:complications* / Q000209:etiology / Q000473:pathology; D020432:Trochlear Nerve Diseases / Q000209:etiology*