title: MR imaging of Tornwaldt's cysts.
abstract: OBJECTIVE
  The purpose of this study was to assess the characteristics of Tornwaldt's cysts as revealed by routine MR studies.
  
  
  METHODS
  We retrospectively reviewed MR images of the brain in 1208 consecutive subjects who ranged in age from 3 weeks to 93 years (mean, 57.1 years). The signal intensity, shape, and size of Tornwaldt's cysts were assessed. Patients with Tornwaldt's cysts were then questioned about the presence of persistent nasal discharge, occipital headaches, and halitosis and an unpleasant taste in the mouth and about a history of adenoidectomy.
  
  
  RESULTS
  Tornwaldt's cysts were found in 23 patients (1.9%) who ranged in age from 39 to 78 years (mean, 57.3 years). Of the 23 Tornwaldt's cysts, all were isointense to CSF on T2-weighted images and hyperintense to gray matter on the fluid-attenuated inversion-recovery images. The cysts showed high signal intensity compared with muscle on T1-weighted images. Nineteen cysts were round and four were oval. The mean size of the lesions was 6.0 mm in the major axis and 5.5 mm in the minor axis. Two patients with Tornwaldt's cysts had persistent nasal discharge and occipital headaches, and another patient had occipital headaches alone. None of the patients had undergone an adenoidectomy.
  
  
  CONCLUSIONS
  Lesions consistent with Tornwaldt's cysts were found in 1.9% of the routine MR studies of the brain. The cysts had high signal intensity on T1-weighted, T2-weighted, and fluid-attenuated inversion-recovery images.
authors.affiliation: Department of Radiology, Miyakonojo Medical Association Hospital, Miyazaki, Japan.
authors.forename: I
authors.initials: I
authors.lastname: Ikushima
authors.forename: Y
authors.initials: Y
authors.lastname: Korogi
authors.forename: O
authors.initials: O
authors.lastname: Makita
authors.forename: Y
authors.initials: Y
authors.lastname: Komohara
authors.forename: H
authors.initials: H
authors.lastname: Kawano
authors.forename: M
authors.initials: M
authors.lastname: Yamura
authors.forename: K
authors.initials: K
authors.lastname: Arikawa
authors.forename: M
authors.initials: M
authors.lastname: Takahashi
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002648:Child; D002675:Child, Preschool; D003560:Cysts / Q000175:diagnosis*; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008279:Magnetic Resonance Imaging / Q000295:instrumentation / Q000379:methods; D008297:Male; D008875:Middle Aged; D009302:Nasopharyngeal Diseases / Q000175:diagnosis*; D009305:Nasopharynx / Q000473:pathology; D012189:Retrospective Studies; D013577:Syndrome