title: Histopathologic and radiographic findings of the simple bone cyst.
abstract: OBJECTIVE
  The purpose of this study is to examine the correlation between histopathologic and radiographic findings and to discuss the cause of the simple bone cyst.
  
  
  METHODS
  Histopathologically, we classified 53 simple bone cysts into two types. Type A has a connective tissue membrane and type B has a partially thickened wall with dysplastic bone formation. Radiographically, we evaluated the following: margin, radiolucency, or radiopacity, relationship with tooth apices, bucco-lingual bone expansion, and displacement of the mandibular canal.
  
  
  RESULTS
  Bone expansion and radiopacity were closely related to histopathologic findings although there was no correlation between the histopathologic findings and radiographic margin, relationship with tooth apices, and displacement of mandibular canal. Local recurrence was more likely to be observed in patients diagnosed as having type B than type A lesions.
  
  
  CONCLUSIONS
  Type A and type B bone cysts may have different causes. Cysts determined radiographically to be radiopaque, those diagnosed as type B histopathologically, and cysts that have been treated surgically should all be followed by radiographic examinations.
authors.affiliation: Faculty of Dentistry, Osaka University, Suita, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Matsumura
authors.forename: S
authors.initials: S
authors.lastname: Murakami
authors.forename: N
authors.initials: N
authors.lastname: Kakimoto
authors.forename: S
authors.initials: S
authors.lastname: Furukawa
authors.forename: M
authors.initials: M
authors.lastname: Kishino
authors.forename: T
authors.initials: T
authors.lastname: Ishida
authors.forename: H
authors.initials: H
authors.lastname: Fuchihata
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D003238:Connective Tissue / Q000473:pathology; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007570:Jaw Cysts / Q000145:classification / Q000000981:diagnostic imaging / Q000209:etiology / Q000473:pathology* / Q000601:surgery; D008297:Male; D008334:Mandible / Q000000981:diagnostic imaging / Q000473:pathology; D008336:Mandibular Diseases / Q000145:classification / Q000000981:diagnostic imaging / Q000209:etiology / Q000473:pathology* / Q000601:surgery; D008875:Middle Aged; D011859:Radiography; D012008:Recurrence; D019227:Tooth Apex / Q000000981:diagnostic imaging