Meningiomas: treated and untreated.

Meningiomas are frequently amenable to total resection. On review of a 10-year series of these tumours in Western Australia it was found that 18 out of total 78 were undiagnosed during life. Analysis of the present series is undertaken as well as comparison with other series in the literature in respect of the overall clinical picture. It is suggested that, in cases of gradual psychological deterioration, the presence of a benign intracranial space-occupying lesion ought to be excluded.