title: Isolated index finger palsy due to cortical infarction.
abstract: The case of an 86-year-old man presenting with isolated left index finger palsy caused by infarction on the lateral side of the right precentral knob is presented. Embolization from aortic atheroma was considered the cause of infarction. Cases with selective palsy of a particular group of fingers without sensory deficits due to cortical infarction of the precentral knob have been reported by several authors, and predominant weakness of radial-side fingers is known to be usually caused by laterally located infarction of the precentral knob. Among the previous reports, only 1 case involved isolated index finger palsy by an atypical, medially located infarction of the precentral knob in association with a concurrent nonrelated lesion. This is the first reported isolated index finger palsy caused by a single lateral precentral knob infarction.
authors.affiliation: Department of Neurology, Yokohama Sakae Kyosai Hospital, Yokohama, Japan; Department of Stroke Medicine, Yokohama Sakae Kyosai Hospital, Yokohama, Japan. Electronic address: y-kawabat@hotmail.co.jp.
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Kawabata
authors.affiliation: Department of Neurology, Yokohama Sakae Kyosai Hospital, Yokohama, Japan; Department of Stroke Medicine, Yokohama Sakae Kyosai Hospital, Yokohama, Japan.
authors.forename: Yosuke
authors.initials: Y
authors.lastname: Miyaji
authors.affiliation: Department of Neurology, Yokohama Sakae Kyosai Hospital, Yokohama, Japan; Department of Stroke Medicine, Yokohama Sakae Kyosai Hospital, Yokohama, Japan.
authors.forename: Hideto
authors.initials: H
authors.lastname: Joki
authors.affiliation: Department of Stroke Medicine, Yokohama Sakae Kyosai Hospital, Yokohama, Japan; Department of Neurosurgery, Yokohama Sakae Kyosai Hospital, Yokohama, Japan.
authors.forename: Syunsuke
authors.initials: S
authors.lastname: Seki
authors.affiliation: Department of Stroke Medicine, Yokohama Sakae Kyosai Hospital, Yokohama, Japan; Department of Neurosurgery, Yokohama Sakae Kyosai Hospital, Yokohama, Japan.
authors.forename: Kentaro
authors.initials: K
authors.lastname: Mori
authors.affiliation: Department of Stroke Medicine, Yokohama Sakae Kyosai Hospital, Yokohama, Japan; Department of Neurosurgery, Yokohama Sakae Kyosai Hospital, Yokohama, Japan.
authors.forename: Tomoya
authors.initials: T
authors.lastname: Kamide
authors.affiliation: Department of Stroke Medicine, Yokohama Sakae Kyosai Hospital, Yokohama, Japan; Department of Neurosurgery, Yokohama Sakae Kyosai Hospital, Yokohama, Japan.
authors.forename: Akira
authors.initials: A
authors.lastname: Tamase
authors.affiliation: Department of Stroke Medicine, Yokohama Sakae Kyosai Hospital, Yokohama, Japan; Department of Neurosurgery, Yokohama Sakae Kyosai Hospital, Yokohama, Japan.
authors.forename: Motohiro
authors.initials: M
authors.lastname: Nomura
authors.affiliation: Department of Stroke Medicine, Yokohama Sakae Kyosai Hospital, Yokohama, Japan; Department of Neurosurgery, Yokohama Sakae Kyosai Hospital, Yokohama, Japan.
authors.forename: Yoshihisa
authors.initials: Y
authors.lastname: Kitamura
authors.affiliation: Department of Neurology, Yokohama City University Graduate School of Medicine, Yokohama, Japan; Department of Stroke Medicine, Yokohama City University Graduate School of Medicine, Yokohama, Japan.
authors.forename: Fumiaki
authors.initials: F
authors.lastname: Tanaka
mesh_terms: D000369:Aged, 80 and over; D001018:Aortic Diseases / Q000150:complications* / Q000175:diagnosis; D020520:Brain Infarction / Q000175:diagnosis / Q000209:etiology*; D002540:Cerebral Cortex / Q000098:blood supply*; D038524:Diffusion Magnetic Resonance Imaging; D017548:Echocardiography, Transesophageal; D005385:Fingers / Q000294:innervation*; D006801:Humans; D020766:Intracranial Embolism / Q000175:diagnosis / Q000209:etiology*; D008297:Male; D010243:Paralysis / Q000175:diagnosis / Q000209:etiology* / Q000503:physiopathology
keywords: Isolated index finger palsy; aortogenic stroke; precentral gyrus; precentral knob; somatotopy