title: Hydroxyapatite ceramics as a particulate embolic material: report of the clinical experience.
abstract: OBJECTIVE
  Our newly developed biocompatible embolic materials, hydroxyapatite ceramic microparticles, have good visibility during injection control and were shown to be capable of producing effective occlusion of the distal arteriocapillary bed in an experimental animal study. The purpose of this present study was to evaluate hydroxyapatite ceramic microparticles for use in human meningioma embolization.
  
  
  METHODS
  Thirteen patients with meningiomas underwent preoperative superselective embolization with the use of hydroxyapatite microparticles. Radiologic and histopathologic studies of the surgical specimens were performed.
  
  
  RESULTS
  During embolization, no microcatheter clogging was observed and angiographic devascularization was consistently obtained without unexpected proximal occlusions. Histopathologic findings showed that there was mild inflammatory response in the thrombosed lumen.
  
  
  CONCLUSIONS
  Hydroxyapatite microparticles are excellent embolic materials for the treatment of human meningioma. They have excellent biocompatibility and good injection control, which produces occlusion of the distal arteriocapillary bed.
mesh_terms: D000328:Adult; D000368:Aged; D001672:Biocompatible Materials / Q000008:administration & dosage*; D002516:Ceramics; D002533:Cerebral Angiography; D017886:Durapatite / Q000008:administration & dosage*; D004621:Embolization, Therapeutic / Q000379:methods*; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008577:Meningeal Neoplasms / Q000098:blood supply* / Q000473:pathology / Q000628:therapy*; D008579:Meningioma / Q000098:blood supply* / Q000473:pathology / Q000628:therapy*; D008833:Microcirculation / Q000473:pathology; D008863:Microspheres; D008875:Middle Aged; D020360:Neoadjuvant Therapy; D010316:Particle Size; D016896:Treatment Outcome
chemical_list: D001672:Biocompatible Materials; D017886:Durapatite