NF2 and Vestibular schwannoma: The low abundance alteration had not been detected by the analysis methods previously used: HRMA and Sanger sequencing of the coding and flanking regions of NF2. Patient 410 shows clinical features consistent with a diagnosis of mosaic NF2: bilateral vestibular schwannomas, one hypoglossal schwannoma and one falx cerebri meningioma, without involvement of peripheral nerves.