The advant of computerized cranial tomography represents a great advance in the diagnosis of very wide variety of intracranial lesions. The CT findings of brain tumors have been reported by many authors, especially by Hatam in early contrast enhancement and evaluation of the intracranial lesions. A statistical analysis was performed with 84 brain tumors cases of with diagnoses were confirmed at the department of Radiology and Pathology of the Middlesex Hospital London from Jan. 1979 to Dec. 1980. The authors classified the intracranial tumors according to Russell and Rubinsteins classification, and especially for the changes after CT introduction. The results were as follows; 1. Brain tumors were found most frequently in middle age group(25.7%) and the ratio of male to female was 2:1. 2. Among the brain tumors, gliomas were found most frequently (57.1%), followed by Meningioma (20.2%), Metastatic tumors (11.9%), and pituitary adenomas (4.8%). 3. The incidence of glioma occupied (57.1%) of all brain tumors and as a entity theses were the highest. 4. Brain tumors occured more frequently in frontal regions. The most frequent location was frontal regions (32.1%), and followed by temporal regions (27.4%), parietal regions (17.0%), sella and parasella regions (11.9%), cerebellum regions (9.5%). 5. Gliomas occured more frequently in temporal regions (20.2%) and followed by frontal regions (16.7%) 6. Since the advant of CT scan, the detection rate of brain tumors was increased, but there was no specific in proportion of tumors.