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.

Synonym(s): acoustic neurinoma, acoustic neuroma, acoustic schwannoma, acoustic tumor, cerebellopontine angle tumor, eighth nerve tumor

Farlex Partner Medical Dictionary © Farlex 2012

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).

Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

Mentioned in

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.

Hearing preservation after cyberknife stereotactic radiosurgery for vestibular schwannomas

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.

Hyperandrogenism in a Postmenopausal Woman Secondary to Testosterone Secreting Ovarian Stromal Tumor with Acoustic Schwannoma

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.

Clinical Profile of Unilateral Proptosis in a Tertiary Care Centre

Out of total 62 cases, acoustic schwannoma accounted for the highest number of cases -42 cases (67.7%).

Cerebellopontine angle lesions--CT and MR imaging evaluation

Dosimetric comparison of Linac-based (BrainLAB) and robotic radio-surgery (CyberKnife) stereotactic system plans for acoustic schwannoma. J Neuro Oncol 2012; 106: 637-42.

Fractionated stereotactic radiosurgery for vestibular schwannomas using cyberknife: A single institution experience

Detection of acoustic schwannoma: use of constructive interference in the steady state three dimensional MR.

DIAGNOSTIC ACCURACY OF MAGNETIC RESONANCE IMAGING IN DETECTION OF ACOUSTIC NEUROMA

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.

Cerebellopontine angle ganglionic hamartoma: case report

A 55-year-old woman with acoustic schwannoma was scheduled for craniotomy.

Peripheral nerve injury caused by misuse of elastic stockings

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.

Stereotactic radiosurgery for brain lesions: an observation and follow-up

Twenty one patients were analysed which show cerebellopontine angle mass characteristic of acoustic schwannoma with male-female ratio of 2:1.

Study of Computed Tomography (CT) scan finding in neurofibromatosis Type 2

Management of acoustic schwannoma. Am J Otolaryngol 2004:25:38-47.

Temporal bone schwannoma