Abstract
Schwannomas are benign tumors originating from the Schwann cells of cranial or spinal nerves. The most common cranial schwannomas originate from the eight cranial nervevestibular schwannomas (VS). VS account for 6–8% of all intracranial tumors, 25–33% of the tumors localized in the posterior cranial fossa, and 80–94% of the tumors in the cerebellopontine angle (CPA). Schwannomas of other cranial nerves/trigeminal, facial, and schwannomas of the lower cranial nerves/are much less frequent. According to the World Health Organization (WHO), intracranial and intraspinal schwannomas are classified as Grade I. Some VS are found incidentally, but most present with hearing loss (95%), tinnitus (63%), disequilibrium (61%), or headache (32%). The neurological symptoms of VSs are mainly due to compression on the surrounding structures, such as the cranial nerves and vessels, or the brainstem. The gold standard for the imaging diagnosis of VS is MRI scan. The optimal management of VSs remains controversial. There are three main management options—conservative treatment or “watch-and-wait” policy, surgical treatment, and radiotherapy in all its variations. Currently, surgery of VS is not merely a life-saving procedure. The functional outcome of surgery and the quality of life become issues of major importance. The most appropriate surgical approach for each patient should be considered according to some criteria including indications, risk–benefit ratio, and prognosis of each patient. The approaches to the CPA and VS removal are generally divided in posterior and lateral. The retrosigmoid suboccipital approach is a safe and simple approach, and it is favored for VS surgery in most neurosurgical centers. Radiosurgery is becoming more and more available nowadays and is established as one of the main treatment modalities in VS management. Radiosurgery (SRS) is performed with either Gamma knife, Cyber knife, or linear accelerator. Larger tumors are being increasingly frequently managed with combined surgery and radiosurgery. The main goal of VS management is preservation of neurological function – facial nerve function, hearing, etc. The reported recurrence rate after microsurgical tumor removal is 0.5–5%. Postoperative follow-up imaging is essential to diagnose any recurrence.
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Gerganov, V., Petrov, M., Sakelarova, T. (2023). Schwannomas of Brain and Spinal Cord. In: Rezaei, N., Hanaei, S. (eds) Human Brain and Spinal Cord Tumors: From Bench to Bedside. Volume 2. Advances in Experimental Medicine and Biology, vol 1405. Springer, Cham. https://doi.org/10.1007/978-3-031-23705-8_12
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