“…The results of these investigations show that the PEG and MCS pic tures generally characterizing NPH are for PEG, the lack of air in the ce rebral sulci and, for MCS, an inversion of the isotope circulation in the CSF, with ventricular invasion and/or delayed clearance of the ventricular/subarachnoid spaces [2,3,6,9,12,14,19,24], However, not all the patients regarded as normotensive hydrocephalic, on the basis of the asso ciation of the clinical, PEG and MCS findings as described above, im prove following CSF surgical shunting. The results of recent researches appear to indicate that further useful information for a correct diagnosis and for surgical prognosis can be obtained from a detailed study of the CSF pressure behaviour [15-18, 25, 27, 28[.…”