“…However, there is a high (though not absolute) correlation between papilloedema and CSF pres-sure in cerebral tumours, known from the literature on lumbar puncture (Lubic and Marotta, 1954;Korein et al, 1959;van der Lugt and Molin, 1968), from continuous recording of ventricular fluid pressure in cerebral tumours (Lundberg, 1960), and confirmed for cisternal fluid pressure in experimental space-occupying lesions (Hayreh, 1968). Accordingly, in the present series the CSF pressure was normal or only slightly raised in seven of the eight cases where it was measured.…”