Treatable dystonia presenting as spastic cerebral palsy

To the Editor.— Cerebral palsy is a disorder with nonprogressive motor impairment that begins in early infancy and is characterized by spasticity or involuntary movements.1 It is classified according to the primary motor disturbance present (spastic, extrapyramidal, hypotonic, and mixed). Approximately 65% of patients with cerebral palsy have the spastic type.2 The term does not imply a specific cause. Prematurity, anoxia, infection, trauma, and metabolic or other pathologic processes may be responsible in individual patients.