The pleiotropic movement disorders phenotype of adult ataxia-telangiectasia.

Objective: To assess the clinical spectrum of ataxia-telangiectasia (A-T) in adults, with a focus on movement disorders.

Methods: A total of 14 consecutive adults with A-T were included at 2 tertiary adult movement disorders centers and compared to 53 typical patients with A-T. Clinical evaluation, neurophysiologic and video-oculographic recording, imaging, laboratory investigations, and ATM analysis were performed.