NF1 and intracranial meningioma: Weissferdt et al. [44] explored the genetic setup of the neurofibromatosis (NF) 2 gene on 22q, the commonest genetic abnormality in meningioma, in nine pleuropulmonary meningothelial lesions (six multiple MMNs and three PPMs) and nine intracranial meningiomas by fluorescence in situ hybridization.