title: Computed diffusion-weighted imaging for differentiating decidualized endometrioma from ovarian cancer.
abstract: OBJECTIVE
  To evaluate the clinical diagnostic ability of computed diffusion-weighted imaging (DWI) for differentiating decidualized endometrioma from ovarian cancer.
  
  
  METHODS
  Computed DWI technique was retrospectively applied to 20 mural nodules in 9 decidualized endometriomas during pregnancy and 20 ovarian cancers. Signal intensities on measured DWI with b values of 800s/mm(2) (DWI800) and on computed DWI with b values of 1500s/mm(2) (cDWI1500) were visually evaluated.
  
  
  RESULTS
  Mural nodules of all decidualized endometriomas showed high signal intensity on DWI800 with significantly higher ADC (2.01±0.26×10(-3)mm(2)/s) and low signal intensity on cDWI1500, whereas solid components of all ovarian cancers showed high signal intensity on both DWI800 with lower ADC (1.08±0.20×10(-3)mm(2)/s) and on cDWI1500.
  
  
  CONCLUSIONS
  Mural nodules in decidualized endometriomas may show high signal intensity on DWI800 due to T2 shine-through effect, and cDWI1500 can distinguish decidualized endometriomas from ovarian cancers by visual evaluation.
authors.affiliation: Department of Radiology, University of Tokushima, 3-18-15, Kuramoto-cho, 7708503 Tokushima, Japan. Electronic address: mayumi@tokushima-u.ac.jp.
authors.forename: Mayumi
authors.initials: M
authors.lastname: Takeuchi
authors.affiliation: Department of Radiology, University of Tokushima, 3-18-15, Kuramoto-cho, 7708503 Tokushima, Japan; Department of Radiological Technology, Tokushima Bunri University, 1314-1, Shido, Sanuki-city, 769-2193 Kagawa, Japan. Electronic address: kenji@kgw.bunri-u.ac.jp.
authors.forename: Kenji
authors.initials: K
authors.lastname: Matsuzaki
authors.affiliation: Department of Radiology, University of Tokushima, 3-18-15, Kuramoto-cho, 7708503 Tokushima, Japan. Electronic address: masafumi@tokushima-u.ac.jp.
authors.forename: Masafumi
authors.initials: M
authors.lastname: Harada
mesh_terms: D000328:Adult; D003937:Diagnosis, Differential; D038524:Diffusion Magnetic Resonance Imaging / Q000379:methods; D004715:Endometriosis / Q000175:diagnosis*; D004717:Endometrium / Q000473:pathology; D005260:Female; D006801:Humans; D010051:Ovarian Neoplasms / Q000175:diagnosis*; D011247:Pregnancy; D011248:Pregnancy Complications / Q000175:diagnosis*; D011252:Pregnancy Complications, Neoplastic; D012189:Retrospective Studies
keywords: Computed DWI (cDWI); Decidualized endometrioma; Diffusion-weighted imaging (DWI); Magnetic resonance imaging (MRI); Ovarian cancer