“…Tumors of different cellular types have their own malig nancy and rate of progression, which may in itself be responsible for differ ences in clinical symptomatology. According to some authors extracerebral meningiomas prevail among patients exhibiting psychic symptoms [Patton and Sheppard, 1956;Avery, 1971;Rieke, 1975;van Oudenaarden, 1978], It is argued that the slow rate of progression inherent to this type of tumor may be responsible for the prevalence of psychic symptoms. Other authors mention a preponderance in numbers of gliomas -and of glioblastoma multiforme in particular -among tumor patients admitted to a psychiatric ward [Guvener et al, 1964;Selecki, 1965;Abraham et al, 1972;Williams et al, 1974;Chodkiewicz et al, 1980].…”