Vascular hyperpermeability as a hallmark of phacomatoses: is the etiology angiogenesis comparable with mechanisms seen in inflammatory pathways? Part I: historical observations and clinical perspectives on the etiology of increased CSF protein levels, CSF clotting, and communicating hydrocephalus: a comprehensive review - Laviv, Yosef; Kasper, Burkhard S; Kasper, Ekkehard M. (Neurosurgical Review, 2018)