title: CT and MR features of nasopharyngeal carcinoma in children and young adults.
abstract: OBJECTIVE
  To clarify CT and MR features of nasopharyngeal carcinoma (NPC) in children and young adults.
  
  
  METHODS
  CT and MR findings of 13 patients (30 years old or younger) with a histopathologic diagnosis of NPC were reviewed.
  
  
  RESULTS
  Skull base invasion (12/13), lymphadenopathy (10/13), and infiltrative growth (8/8) were common findings. The signal intensity of tumours was slightly higher than that of muscles in six cases and isointense to that of muscles in two cases on T1-weighted images; it was higher than that of muscle and lower than that of cerebellar grey matter on T2-weighted images in all cases. Internal signals were homogeneous in both pre- and post-Gd-enhanced MR images in all cases.
  
  
  CONCLUSIONS
  Despite its rarity in this age group, NPC should be included in a differential diagnosis when CT and MR imaging reveal these features.
authors.affiliation: Department of Radiology, National Kyushu Cancer Centre, Fukuoka, Japan. hyabuu@nk-cc.go.jp
authors.forename: Hidetake
authors.initials: H
authors.lastname: Yabuuchi
authors.forename: Tatsuro
authors.initials: T
authors.lastname: Fukuya
authors.forename: Sadayuki
authors.initials: S
authors.lastname: Murayama
authors.forename: Shuji
authors.initials: S
authors.lastname: Sakai
authors.forename: Jun
authors.initials: J
authors.lastname: Okamura
authors.forename: Toshiro
authors.initials: T
authors.lastname: Fukuda
authors.forename: Kichinobu
authors.initials: K
authors.lastname: Tomita
authors.forename: Tokugen
authors.initials: T
authors.lastname: Ro
authors.forename: Kouji
authors.initials: K
authors.lastname: Masuda
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008207:Lymphatic Metastasis; D008279:Magnetic Resonance Imaging; D008297:Male; D009303:Nasopharyngeal Neoplasms / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000473:pathology; D009361:Neoplasm Invasiveness / Q000175:diagnosis / Q000000981:diagnostic imaging; D012189:Retrospective Studies; D012886:Skull / Q000473:pathology; D014057:Tomography, X-Ray Computed