Kufs disease is the adult form of ceroid neurolipofuscinosis, and an u
ncommon cause of degenerative nervous system disease affecting young a
dults. We present here 4 cases of family form I revealed by a dementia
l syndrome. In all 4 patients MRI showed diffuse cortical atrophy pred
ominant in the parietal regions. In 3 of these 4 patients MRI also exh
ibited a low signal in T2-weighted sequences on the putamens. There wa
s no abnormality of the white matter. Diagnosis was made by cerebral b
iopsy in one case and by rectal biopsy in all other cases. Although th
e MRI images are not specific, they must be used when the diagnosis of
Kufs disease is suspected in young patients with demential syndrome.