The time-density curves were collected in 106 patients with intracranial tumors.A de- tailed analysis was made among 66 of them whose illness was determined surgically and pathologically.The scanning technique,method of administration of contrast material in dy- namic CT and its value in the qualitative and differential diagnosis of intracranial tumors were discussed.We consider that 1.dynamic CT scan is performed safely and reliably without trauma or pain on patients.2.Due to their various degrees of vascularity and disorders in the blood-brain barrier,different histological kinds of brain tumors have their own typical time-density curves.3.Vascular disorders such as aneurysm,angioma and arteriovenous mal- formation can be determined and differentiated from intracranial tumors or granuloma based on the typical time-density curves.4.Dynamic CT study is of some value in differential diagnosis of various kinds of brain tumors and is important in differentiation between brain tumors and granulomatous lesions.

CT signs of 20 cases of brain abscess confirmed surgically and pathologically were analyzed in this article. They are often of hypodense lesions with obscure borders. Their periphery presents an isodense image before contrast enhancement, and a clear circular and thin-wall enhancement after contrast enhancement. We conclude that it is necessary to differentiate brain abscess from some intracranial tumors and cerebral cysticercosis sometimes.