Clinical diagnosis: ≥2 non-intradermal SCHs, one pathologically confirmed and no bilateral vestibular SCHs by high quality MRI (some mosaic NF2 patients will be included in the diagnosis at a young age and some schwannomatosis patients may have unilateral vestibular SCHs or multiple meningiomas) or one pathologically confirmed SCH or intracranial meningioma and an affected first degree relative. This evidence concerns the gene NF2 and meningioma.