الفهرس 
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Abstract
Embolization before surgical resection of a tumor has been demonstrated to reduce intraoperative blood loss (Chun et al., 2002).
Hypervascular skull base tumors can pose considerable problems to surgical removal, because their vascular supply is usually difficult to occlude before resection of the bulk of the tumor. Depending on the tumor size, location, pattern of blood supply and the anticipated difficulties of surgical extirpation, preoperative superselective embolization may be required (Gruber et al., 2000)
This technique was first employed by Brooks in 1930 for the treatment of carotid-cavernous fistula. Embolization facilitates tumor resection by limiting blood loss, and causing ischemic necrosis of the lesion. Limited blood loss makes surgical resection safer and improves visualization. Necrosis often leads to softening of the tumor, which not only facilitates resection but also reduce the forces transmitted to the adjacent sensitive neural structures (Rosen et al., 2002)
The purpose of the present study is to review the value and the results of preoperative embolization of vascular intracranial tumors, by a team of neurosurgeons cross-experienced in the application of both microsurgery and endovascular techniques.
This prospective study was conducted between 2004 & 2007 on 29 intracranial tumors, 39 feeding artery were embolized. Digital Subtraction Angiography (DSA) was done to all the patients after the decision was made to go for craniotomy and tumor resection, using the diagnostic catheter.
Detailed follow up to all patients was done, to report the impact of the procedure on their condition. Statistical analysis was done to introduce the criteria of tumor that favors pre-operative embolization and the criteria that introduce a successful embolization procedure.
The details of the techniques applied, clinical data, radiological outcomes and patients’ follow-up were discussed in the study.