title: Histopathological assessment of fatal ipsilateral intraparenchymal hemorrhages after the treatment of supraclinoid aneurysms with the Pipeline Embolization Device.
abstract: OBJECTIVE
  Delayed ipsilateral intraparenchymal hemorrhage has been observed following aneurysm treatment with the Pipeline Embolization Device (PED). The relationship of this phenomenon to the device and/or procedure remains unclear. The authors present the results of histopathological analyses of the brain sections from 3 patients in whom fatal ipsilateral intracerebral hemorrhages developed several days after uneventful PED treatment of supraclinoid aneurysms.
  
  
  METHODS
  Microscopic analyses revealed foreign material occluding small vessels within the hemorrhagic area in all patients. Further analyses of the embolic materials using Fourier transform infrared (FTIR) spectroscopy was conducted on specimens from 2 of the 3 patients. Although microscopically identical, the quantity of material recovered from the third patient was insufficient for FTIR spectroscopy.
  
  
  RESULTS
  FTIR spectroscopy showed that the foreign material was polyvinylpyrrolidone (PVP), a substance that is commonly used in the coatings of interventional devices.
  
  
  CONCLUSIONS
  These findings are suggestive of a potential association between intraprocedural foreign body emboli and post-PED treatment-delayed ipsilateral intraparenchymal hemorrhage.
authors: Division of Neurological Surgery, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona;
authors: Yin C
authors: YC
authors: Hu
authors: Vivek R
authors: VR
authors: Deshmukh
authors: Felipe C
authors: FC
authors: Albuquerque
authors: David
authors: D
authors: Fiorella
authors: Randal R
authors: RR
authors: Nixon
authors: Donald V
authors: DV
authors: Heck
authors: Stanley L
authors: SL
authors: Barnwell
authors: Cameron G
authors: CG
authors: McDougall
mesh_terms: D000368:Aged; D000925:Anticoagulants / Q000627:therapeutic use; D001344:Autopsy; D001672:Biocompatible Materials; D002343:Carotid Artery, Internal / Q000473:pathology; D002533:Cerebral Angiography; D004621:Embolization, Therapeutic / Q000009:adverse effects* / Q000295:instrumentation*; D017809:Fatal Outcome; D005260:Female; D006801:Humans; D002532:Intracranial Aneurysm / Q000150:complications* / Q000601:surgery*; D020300:Intracranial Hemorrhages / Q000209:etiology*; D008297:Male; D008875:Middle Aged; D009422:Nervous System Diseases / Q000209:etiology; D019635:Neurosurgical Procedures / Q000379:methods; D011183:Postoperative Complications / Q000209:etiology* / Q000503:physiopathology; D011205:Povidone; D029424:Pulmonary Disease, Chronic Obstructive / Q000150:complications; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D000925:Anticoagulants; D001672:Biocompatible Materials; D011205:Povidone