Pathology slide of the meningeal tissue from a left temporal craniotomy shows inflammatory cells with lymphoplasmacytic infiltration, foamy histiocytes, and vascular proliferation (hematoxylin and eosin; original magnification, ×150). Pathology slide of the meningeal tissue from a left temporal craniotomy shows inflammatory cells with lymphoplasmacytic infiltration, foamy histiocytes, and vascular proliferation (hematoxylin and eosin; original magnification, ×150). Yu Chang Lee et al. AJNR Am J Neuroradiol 2003;24:119-123 ©2003 by American Society of Neuroradiology