Abstract
Thirteen cases of acoustic tumor manifesting sudden deafness(5 cases treated by the author and 8 cases reported in the literature) were investigated from the clinico-statistical standpoint.
1) 6.4% of patients with acoustic tumor manitested sudden deafness as the initial symptom. In 4 of the 13 patients the onset of acoustic tumor was preceded by symptomsof a common cold. In 6 of the 13 patients vertigo was present as a concomitant symptom.
2) Acoustic tumors manifesting sudden deafness often lacked charcteristic objective symptoms. The frequency of each symptom has been found to be comparable with the figures contained in the previous clinico-statistics on acoustic tumors.
3) Establishment of crucial diagnasis was delayed in most of these cases, the tumors, accordingly constituted brain tumors, 2 cm or greater in diameter, when the treatment started.
