[An unusual CT image of an ischemic focus]

In a 39-year-old man with focal cerebral ischaemia an uncommon CT picture of an ischaemic focus is described. The first CT examination was made two weeks after the development of the disease. After administration of the contrast substance an increased density along the fronte-parietal gyrification was detected. The finding was not typical for an ischaemic lesion. Two weeks after the first CT examination the examination was repeated. After administration of the contrast substance only at some sites the original increased density along the gyrification was found.