[Case of dentatorubral-pallidoluysian atrophy with onset of psychomotor retardation in infancy].

We report a patient with dentatorubral-pallidoluysian atrophy (DRPLA). She developed normally until the age of 6 month, when she could sit by herself. However, her psychomotor development was subsequently slow with gradual appearance of equilibrium disturbances and involuntary movements such as polymyoclonia and chorea.