Since the introduction of the translabyrinthine approach in the treatment of acoustic neuromas in Denmark. 47 patients have been operated on, the series containing 2% small, 60% medium and 38% large tumours. This distribution differs significantly from previously published tumour series, where the large tumours dominated. The paper describes the various diagnostic procedures applied in the present active search for acoustic neuromas, and the reduction in tumour size is ascribed to information on the improved surgical results obtained by the translabyrinthine approach.