title: Early magnetic resonance detection of cortical necrosis and acute network injury associated with neonatal and infantile cerebral infarction.
abstract: BACKGROUND
  Knowledge of MRI findings in pediatric cerebral infarction is limited.
  
  
  OBJECTIVE
  To determine whether cortical necrosis and network injury appear in the acute phase in post-stroke children and to identify anatomical location of acute network injury and the ages at which these phenomena are seen.
  
  
  METHODS
  Images from 12 children (age range: 0-9 years; neonates [<1 month], n=5; infants [1 month-12 months], n=3; others [≥1 year], n=4) with acute middle cerebral artery (MCA) cortical infarction were retrospectively analyzed. Cortical necrosis was defined as hyperintense cortical lesions on T1-weighted imaging that lacked evidence of hemorrhage. Acute network injury was defined as hyperintense lesions on diffusion-weighted imaging that were not in the MCA territory and had fiber connections with the affected cerebral cortex. MRI was performed within the first week after disease onset.
  
  
  RESULTS
  Cortical necrosis was only found in three neonates. Acute network injury was seen in the corticospinal tract (CST), thalamus and corpus callosum. Acute network injury along the CST was found in five neonates and one 7-month-old infant. Acute network injury was evident in the thalamus of four neonates and two infants (ages 4 and 7 months) and in the corpus callosum of five neonates and two infants (ages 4 and 7 months). The entire thalamus was involved in three children when infarction of MCA was complete.
  
  
  CONCLUSIONS
  In acute MCA cortical infarction, MRI findings indicating cortical necrosis or acute network injury was frequently found in neonates and early infants. Response to injury in a developing brain may be faster than that in a mature one.
authors.affiliation: Department of Radiology, Kanagawa Children's Medical Center, 2-138-4 Mutsukawa, Minami-ku, Yokohama, 232-8555, Japan, t_okabe8299@yahoo.co.jp.
authors.forename: Tetsuhiko
authors.initials: T
authors.lastname: Okabe
authors.forename: Noriko
authors.initials: N
authors.lastname: Aida
authors.forename: Tetsu
authors.initials: T
authors.lastname: Niwa
authors.forename: Kumiko
authors.initials: K
authors.lastname: Nozawa
authors.forename: Jun
authors.initials: J
authors.lastname: Shibasaki
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Osaka
mesh_terms: D001921:Brain / Q000473:pathology; D001930:Brain Injuries / Q000209:etiology / Q000473:pathology*; D002540:Cerebral Cortex / Q000473:pathology*; D002648:Child; D002675:Child, Preschool; D042241:Early Diagnosis; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007232:Infant, Newborn, Diseases / Q000473:pathology*; D020244:Infarction, Middle Cerebral Artery / Q000150:complications / Q000473:pathology*; D008279:Magnetic Resonance Imaging; D008297:Male; D009336:Necrosis; D020521:Stroke / Q000209:etiology* / Q000473:pathology*