gms | German Medical Science

60th Annual Meeting of the German Society of Neurosurgery (DGNC)
Joint Meeting with the Benelux countries and Bulgaria

German Society of Neurosurgery (DGNC)

24 - 27 May 2009, Münster

CT angiography and perfusion CT in evaluation of extracranial-intracranial bypass grafts

Meeting Abstract

  • S. Langner - Institut für Diagnostische Radiologie und Neuroradiologie, Ernst-Moritz-Arndt Universität Greifswald
  • S. Fleck - Klinik für Neurochirurgie, Ernst-Moritz-Arndt-Universität
  • H.W.S. Schroeder - Klinik für Neurochirurgie, Ernst-Moritz-Arndt-Universität
  • N. Hosten - Institut für Diagnostische Radiologie und Neuroradiologie, Ernst-Moritz-Arndt Universität Greifswald
  • M. Kirsch - Institut für Diagnostische Radiologie und Neuroradiologie, Ernst-Moritz-Arndt Universität Greifswald

Deutsche Gesellschaft für Neurochirurgie. 60. Jahrestagung der Deutschen Gesellschaft für Neurochirurgie (DGNC), Joint Meeting mit den Benelux-Ländern und Bulgarien. Münster, 24.-27.05.2009. Düsseldorf: German Medical Science GMS Publishing House; 2009. DocP13-02

doi: 10.3205/09dgnc388, urn:nbn:de:0183-09dgnc3888

Published: May 20, 2009

© 2009 Langner et al.
This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( You are free: to Share – to copy, distribute and transmit the work, provided the original author and source are credited.



Objective: Extracranial-to-intracranial (EC-IC) bypass surgery remains an important treatment alternative for patients with occlusive cerebrovascular disease. The aim of our study was to use CT perfusion (CTP) and CT angiography (CTA) to evaluate cerebral hemodynamics and bypass patency in such patients before and after EC-IC high-flow surgery.

Methods: Six patients underwent CTP and CTA studies before and after bypass surgery. Pre- and postoperatively we also performed digital subtraction angiography. Surgery consisted of middle cerebral artery-superficial temporal artery bypass with saphenous vein grafts. CTP was performed at the level of the basal ganglia (2 slices, 12mm slice thickness, 1 scan/s for 40s, 40ml contrast agent, flow 5.9 ml/s). Color-coded perfusion maps for rCBV, rCBF and TTP were calculated. CTA reached from the level of vertebra C6 to the roof of the lateral ventricles. Vessels were analyzed using axial source images, MIP- and VRT-reconstructions.

Results: Preoperative CTP showed significantly prolonged MTT and reduced rCBF of the affected hemisphere. No patient developed neurological deterioration after operation. Proximal and distal anastomosis as well as the course and caliber of the bypass could be evaluated by CTA. Patency of the bypass could be visualized by CTA in all patients. Postoperative CTP showed improved cerebral hemodynamics with a return of perfusion parameters to nearly normal values.

Conclusions: CTP can be used for the pre- and postoperative evaluation of patients who receive EC-IC bypass grafts. CTA is a viable alternative to DSA to assess the patency of these bypass grafts.