A series of cerebral scannings using radioactive chlormerodrin and photoscanning has been presented. The result of scanning of 32 cases indicated that in the group of 20 cases of brain tumor the accuracy is 85%. Astrocytoma as a group had a lower uptake. Meningioma, metastasis, and glioblastoma gave excellent scannings. Advantages over cerebral angiography and air study include the complete freedom from complications and discomfort. The exact position and size of intracranial tumors are portrayed accurately by cerebral scanning. Cerebral scanning is a valuable adjunct in diagnosis of intracranial brain tumors and should become a routine part of the investigation.