**Intracranial Arterial Collateralization: Relevance in Neuro-Endovascular Procedures**

Peng R. Chen1, Adnan H. Siddiqui2 and Peng Roc Chen3

*1Department of Neurosurgery, University of Texas Medical School at Houston, Houston, Texas; 2Department of Neurosurgery, School of Medicine and Biomedical Sciences, State University of New York, University at Buffalo, Buffalo, New York, 3Department of Neurosurgery University of Texas Medical School at Houston, USA* 
