Primary brain tumors in adults are less common than metastatic tumors. The most frequent are glioblastoma multiforme, metastases, anaplastic astrocytoma, meningioma, pituitary tumors and vestibular schwannoma. 70% of the tumors in adults are supratentorial. The most infratentorial tumors are
The residual function of the vestibular system before surgery differs considerably between patients, due to extent and influence of tumor growth, resulting in varying spectra of post-surgery illness as well as vestibular symptoms. An acute unilateral vestibular deafferentation (uVD) (if significant