The use of computed tomography is most reliable in diagnosis and management of brain abscess. Authors analized 17 cases of pathologically and clinically proven brain abscess during the period of 39 months from Jan. 1978 to Mar. 1982 at National Medical Center. The results were as follows: 1. The sex ratio 9 males to 8 females, and no sex difference was seen, and the greatest number of cases were seen below the age of 30(65%). 2. The otogenic infection was the most frequent predisposing factors (8 cases). Other predisposing factors were postoperative infection (2 cases), pulmonary infection (2 cases), and congenital heart disease (2 cases). The most common site of involvement was posterior fossa (5 cases). Next was temporal lobe (4 cases), and temporoparietal lobe (3 cases). 3. Most common presenting symptoms were headache, fever, focal neurological signs, and dizziness. 4. Among the 22 grain abscesses of 17 patients, the most frequent CT finding in precontrast scan was a low density surrounded by a faint dense of dense ring (11 cases). Next was purely low density (6 cases). Associated hydrocephalus was found in 4 cases, and multiple or multiloculated abscess was seen in 4 cases. 5. In post contrast scan, brain abscess usually show complete, oval or round shaped, thin, evening ring enhancement with mild or moderate surrounding edema, but there was no specific enhancement.