title: Self-closing U-clips for intracranial microanastomoses in high-flow arterial bypass: technical case report.
abstract: OBJECTIVE
  Self-closing nitinol U-clips (Medtronic, Inc., Minneapolis, MN) have been used to create vascular microanastomoses by vascular surgeons. This device eliminates the need for suture management and knot tying. Therefore, a high-quality interrupted microvascular anastomosis can be obtained in a shorter period of time. This is the first report of a U-clip intracranial arterial microanastomosis for a high-flow extracranial-intracranial bypass using a radial artery graft.
  
  
  METHODS
  A 24-year-old woman with a history of chronic headache was admitted to the National Neurological Institute Carlo Besta after a brain computed tomographic scan revealed a giant serpentine aneurysm of her right middle cerebral artery. Magnetic resonance angiography and four-vessel angiography confirmed the diagnosis and ruled out other lesions.
  
  
  METHODS
  A radial artery graft was used to create a high-flow bypass between the external carotid artery and the postaneurysmal M2 segment of the right middle cerebral artery. Nitinol self-closing U-clips were used for the interrupted intracranial microanastomosis. After intraoperative near-infrared indocyanine green video angiography confirmed the bypass patency, the aneurysm could be trapped.
  
  
  CONCLUSIONS
  The postoperative course was uneventful. The patient was discharged on the seventh postoperative day and was neurologically intact. Postoperative angiography documented the successful exclusion of the aneurysm and the presence of revascularization of the distal branches of the right middle cerebral artery through the bypass. This case demonstrates the efficacy of U-clips for intracranial microanastomoses.
authors.affiliation: Department of Neurosurgery, National Neurological Institute Carlo Besta, Milan, Italy. ferrolipaolo@hotmail.com
authors.forename: Paolo
authors.initials: P
authors.lastname: Ferroli
authors.forename: Federico
authors.initials: F
authors.lastname: Biglioli
authors.forename: Elisa
authors.initials: E
authors.lastname: Ciceri
authors.forename: Alessandro
authors.initials: A
authors.lastname: Addis
authors.forename: Giovanni
authors.initials: G
authors.lastname: Broggi
mesh_terms: D000328:Adult; D000714:Anastomosis, Surgical / Q000295:instrumentation*; D002533:Cerebral Angiography; D002548:Cerebral Revascularization / Q000295:instrumentation* / Q000379:methods; D005260:Female; D006261:Headache / Q000209:etiology; D006801:Humans; D002532:Intracranial Aneurysm / Q000150:complications / Q000601:surgery*; D018810:Magnetic Resonance Angiography; D013525:Surgical Instruments