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Central nervous system effects in acute thallium poisoning
Yu-Tai Tsai1, Chin-Chang Huang, Hung-Chou Kuo
1Department of Neurology, Chang Gung Memorial Hospital and University, 199 Tung-Hwa North Road, Taipei, Taiwan.
Neurotoxicology
|December 13, 2005
Summary
Acute thallium intoxication can cause central nervous system damage, including memory loss and brain lesions. Fortunately, symptoms and MRI findings show improvement over time with treatment.
Area of Science:
- Toxicology
- Neurology
- Radiology
Background:
- Thallium poisoning is a rare but serious condition.
- Central nervous system (CNS) involvement is a known complication of thallium intoxication.
Observation:
- Two patients with acute thallium intoxication presented with neurological symptoms like confusion, hallucinations, and peripheral neuropathy.
- Neuropsychological testing revealed significant memory impairments, including deficits in registration, recall, recognition, and verbal fluency.
- Brain Magnetic Resonance Imaging (MRI) identified lesions in the corpus striatum in one patient.
Findings:
- High thallium levels were confirmed in biological samples (urine, blood) and environmental sources (drinking water).
- Clinical and neuropsychological symptoms showed slow but progressive improvement during follow-up.
- Follow-up brain MRI demonstrated resolution of the corpus striatum lesions after 1.5 months.
Implications:
- Thallium intoxication can lead to encephalopathy with distinct neurological and cognitive deficits.
- Brain MRI is a valuable tool for visualizing acute brain lesions in severe thallium poisoning.
- Neuropsychological assessments are crucial for detecting and monitoring memory impairments, which may persist even after lesion resolution.