title: [Plaque characterization using carotid MRI in acute ischemic cerebrovascular syndromes (three case reports)--can carotid MRI be useful as an adjunct to the diagnosis of TIA in which the ischemic lesions were recognized at a later date?].
abstract: Recent diffusion-weighted imaging (DWI) studies describe a relevant ischemic lesion in almost half of all patients with transient ischemic attack (TIA). We report 3 cases of TIA in which the ischemic lesions were recognized on DWI at a later date ("late-imaged TIA"). Three men (average age, 72.7 years) were admitted to our hospital on complains of monoparesis or sensory disturbance in their right arms. On admission, no apparent ischemic lesion was detected by DWI; however, spotty lesions were apparent in the left precentral or postcentral gyrus on hospital days 2-5. The neurological symptoms resolved within 24 hours, and all the cases were clinically diagnosed as TIA. Carotid MRI revealed low-grade stenosis of the left internal carotid artery with atherosclerotic plaque, characterized as so-called "vulnerable plaque". These findings suggest that the carotid atherosclerotic plaque lead to artery-to-artery embolism. Carotid MRI is considered useful as an adjunct to other imaging modalities in the diagnosis of late-imaged TIA.
authors.affiliation: Department of Neurosurgery, Kurashiki Central Hospital, Japan.
authors.forename: Hideki
authors.initials: H
authors.lastname: Endo
authors.forename: Kazumichi
authors.initials: K
authors.lastname: Yoshida
authors.forename: Takeshi
authors.initials: T
authors.lastname: Funaki
authors.forename: Kenichi
authors.initials: K
authors.lastname: Kono
authors.forename: Nobutake
authors.initials: N
authors.lastname: Sadamasa
authors.forename: Osamu
authors.initials: O
authors.lastname: Narumi
authors.forename: Masaki
authors.initials: M
authors.lastname: Chin
authors.forename: Sen
authors.initials: S
authors.lastname: Yamagata
mesh_terms: D000368:Aged; D002545:Brain Ischemia / Q000175:diagnosis*; D002339:Carotid Arteries / Q000473:pathology*; D016893:Carotid Stenosis / Q000175:diagnosis* / Q000473:pathology*; D002561:Cerebrovascular Disorders / Q000175:diagnosis*; D038524:Diffusion Magnetic Resonance Imaging; D006801:Humans; D002546:Ischemic Attack, Transient / Q000175:diagnosis*; D018810:Magnetic Resonance Angiography; D008297:Male; D013577:Syndrome; D013997:Time Factors