Trends in the incidence of primary intracranial tumors in Kumamoto, Japan.

摘要: Background. The introduction of modern neuro-imaging techniques, as well various environmental factors, have been changing the incidence and proportions types clinically diagnosed intracranial tumors. aim this study was to determine recent trends in occurrence primary tumors residents Kumamoto Prefecture, Japan. Methods. We surveyed 2129 patients who were with between 1989 1998, histological diagnosis being obtained 71% patients. Results. Of patients, 710 (33.3%) had meningiomas, 390 (18.3%) pituitary adenomas, 315 (14.8%) malignant gliomas, 208 (9.8%) schwannomas. overall age-adjusted rates 10.97/100 000/year (males, 9.70; females, 11.86). One hundred nine (5.1%) younger than 15 years, 480 (22.5%) older 70 years. most common children astrocytomas (37.6%), followed by germ-cell (16.5%) craniopharyngiomas (11.9%), medulloblastomas (11.0%), ependymomas (4.6%). Meanwhile, elderly meningioma (51.7%), glioma (13.7%), adenoma (11.4%), schwannoma (7.7%), lymphoma (4.6%), astrocytoma (2.7%). proportion asymptomatic increased, from 24.6% 1989–1994 33.0% 1995–1998; 169 (62.8%) adenomas (14.1%). Conclusion. detection rate tumors, particularly that brain are on increase. Differences medulloblastomas, Japanese population populations Western countries may be attributable ethnic differences.