The advant of computerized cranial tomography represents a great advance in the diagnosis of very wide varietyof intracranial lesions. The CT findings of brain tumors have been reported by many authors, especially by Hatamin early contrast enhancement and evaluation of the intracranial lesions. A statistical analysis was performedwith 84 brain tumors cases of with diagnoses were confiremd at the department of Radiology and Pathology of theMiddlesex Hospital London from Jan. 1979 to Dec. 1980. The authors classified the intracranial tumors according toRussel and Rubinsteins classification, and especially for the changes after CT introduction. The results were asfollows; 1. Brain tumors were found most frequently in middle age group (25.7%) and the ration of male to femalwas 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 braintumors and as a entity these were the highest. 4. Brain tumors occured more fequently in frontal regions (27.4%),parietal regions(17.0%), sella and para sella-regions(11.9%), cerebellum regions(9.5%). 5. Gliomas occured morefrequently inn 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 change in proportion of tumors.