Massive intra and extracranial bening meningioma metastasizing to the lung and spine: the probelm of meningiomas classdification and iatrogenic metastasizing - Drews, Henning; Figueiredo, Eberval Gadelha de; Cabrera, Hector Navarro; Welling, Leonardo Christian; Teixeira, Manoel Jacobsen (Arquivos brasileiros de neurocirurgia, 2012)