Reliability and limitations of a scan echoencephalography after six years experience in diagnosing intracranial space occupying lesions

260 patients suspicious to have a space occupying lesion were investigated by angiography, ventriculography and echo-enecphalography over the last six years. The reliability of the A mode echograms was demonstrated in both supratentorial tumours for the presence of a midine echo shift and in infratentorial tumours for the size and degree of 3rd ventricular dilatation. The limitations and errors of echo are discussed and correlated with those of other invasive diagnostic radiological procedures