The aim of the study was establishing of correlations between the age of patients and their present and past diseases on one hand and the presence and intensity of leukoaraiosis (LA) on the other hand. The studied material comprised 91 patients hospitalized between Jan 1 1995 and June 15 1996 in whom features of LA were found on CT or MRI examination. Women and patients aged over 70 years prevailed in the group. Clinical analysis was based on neurological findings and routine diagnostic investigations. The intensity of LA lesions was assessed by means of a four grade scoring system known in literature. The analysis showed that higher grades of LA were more frequent on older patients: 14 had grade IV LA and 80 or more years of age. The greatest number of the patients had grade III LA and most of them were in the age range 70-80 years. Arterial hypertension was present in 64% of the patients, and more frequently it was associated with LA in younger patients. Stroke and myocardial infarction were given by 31% an 33% of the patients respectively in the history. Several had more than one stroke. Diabetes was found in 21 patients. Ischaemic brain episodes were the most cause of hospitalization.