Which of the following statements are FALSE about acoustic neuroma?

Vestibular schwannomas or acoustic neuromas originate in the internal auditory canal from the inferior or superior poion of the vestibular nerve. Acoustic neuromas account for 8% to 10% of all intracranial tumours in adults. The lack of a dural tail on MRI differentiates acoustic neuromas from cerebellopontine angle meningiomas. Most tumours are unilateral. Genetic association is with a lack of tumour suppressor gene on Chromosome 22.