Basal ganglia lesions following carbon monoxide poisoning

Primary objectives: Carbon monoxide (CO) is the most common cause of poisoning and may result in basal ganglia lesions. This study reviewed the literature of carbon monoxide poisoning and basal ganglia lesions and prospectively assessed the prevalence of basal ganglia lesions in a cohort of patients with CO poisoning. Research design: Literature review and prospective cohort study. Methods: This study conducted a comprehensive review of the literature and assessed 73 CO-poisoned patients for basal ganglia lesions on sequential MR scans. Magnetic resonance scans were obtained on day 1, 2 weeks and 6 months post-CO poisoning. Results: The literature review found basal ganglia lesions occur in 4–88% of subjects. Only one patient was found with globus pallidus lesions at 2 weeks and 6 months following CO poisoning, that were not present on the initial day 1 MR scan. Conclusions: Basal ganglia lesions, including lesions of the globus pallidus, may be less common than previously reported.