“…Table 4 lists the noninfectious causes of chronic meningitis and additional central nervous system manifestations, ranging from invasion into the meninges of malignant cells, autoimmune disease, septic embolic processes, and foreign bodies, to so-called idiopathic chronic meningitis, reflecting a so far not yet understood inflammatory process of the meninges [5,8,10,13,22,24,26,27,31]. Table 5 also lists the most important chemical substances which have been reported to elicit irritation/inflammation of the meninges [3,6,7,10,14,29,30,31,33,34,38]. …”