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 ?
Out of total 62 cases, acoustic schwannoma accounted for the highest number of cases -42 cases (67.
Dosimetric comparison of Linac-based (BrainLAB) and robotic radio-surgery (CyberKnife) stereotactic system plans for acoustic schwannoma.
Role of MRI in the evaluation of acoustic schwannoma and its comparison to histopathological findings.
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.
A 55-year-old woman with acoustic schwannoma was scheduled for craniotomy.
SRS was performed for acoustic schwannoma either as first-time treatment or for residual tumor.
Acoustic schwannoma usually tend to show iso to hypodense CPA mass compared to brain in non-contrast CT and show strong enhancement following contrast administration.
PRESENTATION, DIAGNOSIS, MANAGEMENT: A 23years old G2P1L1 diagnosed with acoustic schwannoma presented at 41 weeks of gestation and was posted for an emergency caesarean section along with V-P shunt placement.
Multiple neurofibromas are a distinctive feature of neurofibromatosis (NF) type 1 and bilateral acoustic Schwannomas are a feature of NF type 2.
3) NF2 is mutated in sporadic schwannomas as well as in those occurring in patients with neurofibromatosis 2 who develop bilateral acoustic schwannomas.
Primary extracranial meningiomas of the head and neck have also shown to have a relationship with neurofibromatosis, particularly type 2 NF characterized by bilateral acoustic schwannomas and lack of skin findings and having a defect on chromosome 22q with an autosomal-dominant inheritance pattern [3].

Full browser ?