title: Ovarian fibromas: MR imaging findings with emphasis on intratumoral cyst formation.
abstract: OBJECTIVE
  The purpose of this study was to assess MR imaging findings of ovarian fibromas with emphasis on intratumoral cyst formation.
  
  
  METHODS
  MR images with a 1.5-T unit obtained in 17 consecutive patients (age range, 18-87 years; mean age, 58 years) with 17 histologically proven ovarian fibromas were retrospectively reviewed for the size, configuration, signal intensity of solid components, and presence of cystic degeneration and edema within tumor. Size, number, and location of intratumoral cysts were also assessed.
  
  
  RESULTS
  The maximum diameter of tumors ranged from 3.3 to 19.1cm (mean, 10.9 cm). Seven (41%) tumors were multinodular. On T2-weighted images, solid components of tumors were heterogeneously mixed hypo- and hyperintensity in 16 (94%) tumors. Nine (53%) tumors demonstrated cysts and 16 (94%) demonstrated edema within tumor. The maximum diameter of the largest cysts ranged from 1.0 to 13.2 cm (mean, 6.4 cm), and the number of cysts per tumor ranged from 1 to 60 (mean, 15.6). Of the nine tumors with cystic formation, the predominant location of the cysts was peripheral in five (56%), exophytic in two (22%), central (11%) in one, and diffuse in one (11%).
  
  
  CONCLUSIONS
  Peripheral or exophytic cyst formation may be characteristic MR imaging features with ovarian fibromas.
authors.affiliation: Department of Radiology, Gifu University School of Medicine, 1-1 Yanagido, Gifu 501-1194, Japan. hkato@gifu-u.ac.jp
authors.forename: Hiroki
authors.initials: H
authors.lastname: Kato
authors.forename: Masayuki
authors.initials: M
authors.lastname: Kanematsu
authors.forename: Hiromi
authors.initials: H
authors.lastname: Ono
authors.forename: Ryuichiro
authors.initials: R
authors.lastname: Yano
authors.forename: Tatsuro
authors.initials: T
authors.lastname: Furui
authors.forename: Ken-Ichirou
authors.initials: K
authors.lastname: Morishige
authors.forename: Yuichiro
authors.initials: Y
authors.lastname: Hatano
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D005350:Fibroma / Q000150:complications* / Q000473:pathology*; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008875:Middle Aged; D010048:Ovarian Cysts / Q000209:etiology* / Q000473:pathology*; D010051:Ovarian Neoplasms / Q000150:complications* / Q000473:pathology*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D047368:Tumor Burden; D055815:Young Adult
keywords: Cyst; Exophytic; Fibroma; Ovary; Peripheral