title: [Normal pneumatization time of paranasal sinuses in 799 children: evaluation with magnetic resonance imaging].
abstract: OBJECTIVE
  To evaluate the onset of initial pneumatization of paranasal sinuses with magnetic resonance imaging (MRI) and provides references in the diagnosis and treatment of pediatric paranasal sinuses disease.
  
  
  METHODS
  The MRI images of paranasal sinuses were retrospectively reviewed for 799 children of 0 month to 15 years old and the first pneumatization time of paranasal sinuses were analyzed.
  
  
  RESULTS
  The ethmoidal sinuses was the first pneumatized in 100% (46/46) of newborn children. And 45.7% (21/46) of maxillary sinuses showed pneumatization during the first month of life and 97.8% (45/46) were pneumatized at 7 - 12 months. The pneumatized sphenoid sinuses was first identified as early as 4 months. And 86% (43/50) were pneumatized from 1 to 2 years old. Frontal sinuses was the last pneumatized paranasal sinuses. And 8% (4/50) of frontal sinuses were pneumatized at 1 - 2 years old and 97.8% (42/43) showed pneumatization at 14 - 15 years old.
  
  
  CONCLUSIONS
  MRI may be used to observe the pneumatization of paranasal sinuses. The initial pneumatization time of paranasal sinuses is earlier than previously described.
authors.affiliation: Department of Radiology, the Second Affiliated Hospital, Wenzhou Medical College, Wenzhou 325000, China.
authors.forename: Yan-xu
authors.initials: YX
authors.lastname: Ma
authors.forename: Wen-juan
authors.initials: WJ
authors.lastname: Zhang
authors.forename: Zhi-han
authors.initials: ZH
authors.lastname: Yan
authors.forename: Jia-wei
authors.initials: JW
authors.lastname: He
authors.forename: Xiao-jie
authors.initials: XJ
authors.lastname: Cheng
authors.forename: Yong-jiao
authors.initials: YJ
authors.lastname: Wang
authors.forename: Cheng-bing
authors.initials: CB
authors.lastname: Zhang
authors.forename: Lei
authors.initials: L
authors.lastname: He
mesh_terms: D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D005260:Female; D005626:Frontal Sinus / Q000033:anatomy & histology; D006801:Humans; D007223:Infant; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D010256:Paranasal Sinuses / Q000033:anatomy & histology*; D012189:Retrospective Studies; D013101:Sphenoid Sinus / Q000033:anatomy & histology