Hematoxilin and eosin-stained sections showing () a normal arachnoid monolayer (a) and dura mater (d) and () meningothelial proliferation (a*) characterized by multiple layers of arachnoid cells

<b>Copyright information:</b>Taken from "Natural History of Meningioma Development in Mice Reveals: A Synergy of and Mutations"Brain Pathology (Zurich, Switzerland) 2008;18(1):62-70.Published online Jan 2008PMCID:PMC2253711.© 2007 The Authors; Journal compilation © 2007 International Society of Neuropathology () Immunostaining for Prostaglandin D2 synthase (PGDS) of mouse normal leptomeninges and () meningothelial proliferation. Similar PGDS staining patterns of normal arachnoid and meningothelial proliferation showing intracytoplasmic granules with perinuclear distribution.