[en] We reviewed the CT examinations and clinical records of 31 patients of purulent meningitis to evaluate the relation of CT findings to pathogenic bacteria and clinical course. The most frequently observed abnormal CT finding was an enlargement of the subarachnoid space and ventricles. There was no relationship between those abnormal CT findings and pathogenic bacteria. Enlargement of ventricles, low density area of the white matter and subdural effusion suggested the necessity of the surgical treatment or poor prognosis. The patients with convulsion or re-elevation of CRP had a tendency to show an exacerbation of such abnormalities. On the contrary, abnormal CT findings improved in the patients without convulsion or with decrease of CRP. We conclude that a follow-up CT examination is indicated in cases developing convulsion or re-elevation of CRP. (author)