title: Simple bone cyst: a discrepancy between magnetic resonance imaging and surgical observations.
abstract: OBJECTIVE
  The purpose of this study was to compare magnetic resonance (MR) imaging and surgical observations of fluid in simple bone cysts.
  
  
  METHODS
  Findings during MR imaging of 7 simple bone cysts were compared with surgical observations 1 day or 1.8 months (mean) after MR imaging.
  
  
  RESULTS
  All MR images showed cavities filled with fluid. In 2 patients operated on the day after the imaging, surgical observations were in accordance with the MR findings. At surgery 1.8 months after the MR examination, 4 cavities were found to be empty and 1 cavity contained only a minor amount of fluid.
  
  
  CONCLUSIONS
  A discrepancy between MR imaging and surgical observations of fluid in simple bone cyst cavities was observed that might be dependent on the time between the observations, indicating that a fairly rapid absorption of fluid might occur or that the amount of fluid in a simple bone cyst can vary for unknown reasons.
authors.affiliation: Department of Oral and Maxillofacial Surgery, School of Dentistry and Rigshospitalet, University of Copenhagen, Denmark. lars.o.eriksson@skaue.se
authors.forename: L
authors.initials: L
authors.lastname: Eriksson
authors.forename: L G
authors.initials: LG
authors.lastname: Hansson
authors.forename: L
authors.initials: L
authors.lastname: Akesson
authors.forename: F
authors.initials: F
authors.lastname: Ståhlberg
mesh_terms: D000293:Adolescent; D020420:Cyst Fluid; D005260:Female; D006801:Humans; D007570:Jaw Cysts / Q000473:pathology* / Q000601:surgery; D008279:Magnetic Resonance Imaging; D008297:Male; D008336:Mandibular Diseases / Q000473:pathology* / Q000601:surgery; D013997:Time Factors