Incidence of second brain tumours after pituitary irradiation in Edinburgh 1962-1990.

Two hundred and ninety-six patients irradiated for pituitary adenoma in Edinburgh between 1962 and 1990 were reviewed. The number of subsequent tumours was noted. The expected incidence of tumours was estimated, based on data from the Scottish Cancer Registry, for an age and sex matched population. One malignant brain tumour was found; the expected incidence was 0.3 (95% CI 0-12). One meningioma was reported. Thirty non-CNS tumours were found, compared with an expected incidence of 17.5 (95% CI 12-26). We see no reason at present to alter our practice as a result of radiation induced neoplasia in this group, although close follow-up continues.