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Chapter-075 Intracranial Schwannomas

BOOK TITLE: Textbook of Contemporary Neurosurgery (2 Volumes)

Author
1. Chakravarthi Vasudevan M
ISBN
9789350252390
DOI
10.5005/jp/books/11681_75
Edition
1/e
Publishing Year
2012
Pages
18
Author Affiliations
1. Achanta Lakshmipathi Neurosurgical Center, VHS Hospitals, Chennai, Tamil Nadu, India
Chapter keywords

Abstract

This chapter discusses the most common vestibular and trigeminal and, briefly, the other rare intracranial schwannomas. Schwannomas are the most common tumors of the CPA tumors; they are slow growing and benign. Bilateral vestibular ones associated with NF-2; unilateral ones may be associated with NF-1. The nerve may be preserved at surgery as they arise from myelin sheath (Schwann cells). Hydrocephalus may result from vestibular ones; trigeminal ones do not produce as it extends into middle cranial fossa. Surgery is the mainstay in the management for vestibular schwannomas. There are three different surgical approaches: (i) retrosigmoid (most commonly performed), (ii) translabyrinthine (to preserve the facial nerve when there is no hearing), (iii) the middle cranial fossa (in small intracanalicular tumors). A variety of surgical approaches (frontotemporal craniotomy with or without zygomatic osteotomy, infratemporal fossa interdural approach, retrosigmoid approach. Combined subtemporal presigmoid exposure) in various combinations are routinely used for trigeminal schwannomas. The SRS may be considered in tumors less than 3 cm in size.

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