الفهرس 
introdutionOnly 14 pages are availabe for public view
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Abstract
SUMMARY AND CONCLUSION Almost 10% of all intracranial tumor are located at the CPA and [AC. The otolarynglogist often see patients with dizziness, disequilibrium and unilateral hearing loss with the possibility that these symptoms may be result of retrocochlear lesions. The most common tumor of CPA is the AN (80-90%) and the second most common tumor is meningioma (.1-15%). Other lesions include epidermoid, other cranial nerve shwannoma, arachinoid cyst etc.... Diagnosis of such lesions depends on clinical picture, audiovestibular investigation, and radiological investigation. MRI enhanced with gadolinum is the diagnostic imaging technique of choice in the evaluation of AN and other CPA lesions. The modern era for skull base surgery and transtemporal technique began in 1961 when ”House” introduced the operating microscope and mnllidisciplinnry learn for removal of AN. Also, House established the translabyrinthine and middle fossa approaches. These 2 approaches with the retrosigmoid approach are the standard approaches for AN surgery. There are many other approaches for CPA lesions these surgical approaches should be tailored to a particular patients pathology, functional status, and the surgeon experience. lindoscopic techniques have revolutionized the practic of surgery in many specialities providing in many situation smaller incision, good exposure with high magnification and illiminalion, and ability to look around corner unlike conventional microscope. The first endoscope designed by ”Mit/.e” in 1879 as cystoscope whereas encloscopic neurosurgery was first introduced in 1910 by ”Lespinasse”.