A total of 285 new cases of primary intracranial tumors (PIT: 178 cases, 62) and secondary forms (107 cases, 38) were detected by CT scan and MRI during a population-based study of the incidence rates of these neoplasms in the Aosta Valley (N.W. Italy: 114,325 residents in 1988) during the period 1986–1991. The PIT are discussed in this paper. Histological confirmation was obtained in 60. Age- and sex-adjusted mean annual incidence rate for all PIT was 28.3/100,000 (men 21.7; women 28.1). The incidence rates by types were 9.7 for meningiomas (men 5.3; women 13.9), 9.1 for tumors of the neuroepithelial group (men 10; women 8.1), 3.7 for adenomas (men 2.6; women 4.6), and 1.9 for neurinomas (men 2.9; women 0.9). Incidence rate increased with age. Meningiomas comprised 37 of the PIT, followed by tumors of the neuroepithelial group (35), adenomas (14, neurinomas (7.3) and malignant lymphomas (2.3). The remaining subtypes were 4.6. Our data showed a clearly higher incidence rate than in previous population-based surveys. The differences were most marked in the meningioma group. The extensive use of CT scan and the more intensive case-finding could explain the difference
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