Movement disorders in patients with alternating hemiplegia: "Soft" and "stiff" at the same time.

Objective: To assess nonparoxysmal movement disorders in mutation-positive patients with alternating hemiplegia of childhood (AHC).

Methods: Twenty-eight patients underwent neurologic examination with particular focus on movement phenomenology by a specialist in movement disorders. Video recordings were reviewed by another movement disorders specialist and data were correlated with patients' characteristics.