acoustic schwannoma

vestibular schwannoma

a benign but life-threatening tumor arising from Schwann cells, usually of the vestibular division of the eighth cranial nerve in early stage; produces hearing loss, tinnitus, and vestibular disturbances and in late stages cerebellar, brainstem, and other cranial nerve signs and increased intracranial pressure.

acoustic schwannoma

A non-malignant but hardly benign tumour of the cells of the sheath of Schwann on the acoustic nerve. The tumour causes one-sided deafness and tinnitus and eventually expands inwards into the cranial cavity to occupy the space between the cerebellum and the pons of the brainstem (the cerebello-pontine angle). Surgical approach is difficult but untreated growing tumours are liable to prove fatal. Also known as acoustic neuroma or vestibular schwannoma. (Theodor Schwann, 1810–82, German anatomist).
References in periodicals archive ?
Dosimetric comparison of linac-based (BrainLAB[R]) and robotic radiosurgery (CyberKnife [R]) stereotactic system plans for acoustic schwannoma. J Neurooncol 2012;106:637-42.
MRI brain and internal auditory canal showed a 2.1 x 1.1 x 1 x 1 cm right acoustic schwannoma in the internal auditory canal with extension into the cerebellopontine angle cistern with involvement of the right cochlea and the vestibule with no evidence of pituitary tumor or brain compression.
Malignant tumours were retinoblastoma (1 case, i.e., 4%) Figure 4, Hodgkin's lymphoma (1 case, i.e., 4%), squamous cell carcinoma (3 cases, i.e., 12%) Figure 5, and adenocarcinoma of the lacrimal gland (1 case, i.e., 4%); benign tumours were pleomorphic adenoma of the lacrimal gland (1 case, i.e., 4%) Figure 6, osteoblastoma (1 case, i.e., 4%) Figure 7, lymphangioma (1 case, i.e., 4%) Figure 8, acoustic schwannoma (1 case, i.e., 4%), meningioma (1 case, i.e., 4%), and haemangioma (1 case, i.e., 4%) shown in Table 4.
Out of total 62 cases, acoustic schwannoma accounted for the highest number of cases -42 cases (67.7%).
Dosimetric comparison of Linac-based (BrainLAB) and robotic radio-surgery (CyberKnife) stereotactic system plans for acoustic schwannoma. J Neuro Oncol 2012; 106: 637-42.
Detection of acoustic schwannoma: use of constructive interference in the steady state three dimensional MR.
Cerebellopontine angle tumors correspond 8% of intracranial tumors, and acoustic schwannoma is the most frequent, corresponding to 80-90% of the region, followed by meningioma (510%) and epidermoid (5%) (1,2).
Magnetic resonance imaging revealed a mass on the intracanalicular segment of cranial nerve VIII on the left side, consistent with acoustic schwannoma. She opted for observation of the tumor.
A 55-year-old woman with acoustic schwannoma was scheduled for craniotomy.
In this study, among 37 (52%) patients with brain tumor who underwent SRS, 17 (45.9%) had acoustic schwannoma. SRS was performed for acoustic schwannoma either as first-time treatment or for residual tumor.
Twenty one patients were analysed which show cerebellopontine angle mass characteristic of acoustic schwannoma with male-female ratio of 2:1.
Management of acoustic schwannoma. Am J Otolaryngol 2004:25:38-47.

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