The authors retrospectively reviewed and analyzed CT scans of fifty patients with solitary intracranial lesion selected from 118 patients who ad been confirmed to have intracraial metasasis from 118 patients who had been confirmed to have intracranial netasasis from 1979 to 1985. The results were as follows: 1. The most common primary tumors with solitary metastasis, in order of frequency, were lunh cancer(25), br4east cancer(6), choriocarcinoma(5), colon cancer(5), lymphoma(2) and others(7). 2. Precontrast scans obtained in 35 cases showed cystic very low density in 20%, slightly low density in 9%, isodensity in 20%, high densityin 51% when he densities of the lesions were compared with that of the normal brain tissue. 3. After contrast enhancement 43 out of 50 showed one of 4 patterns of enhancement. 4. The locations of the metastatic lesions were intrassxial in 45 and extraaxial in 5. 5. Degreesof surrounding edema were mild in 32%, moderate in 19% and severe in 49%.