[Parkinsonism probably induced by manganese]

Area of Science:

• Neurology
• Toxicology

Background:

• Parkinsonism in young individuals warrants investigation for secondary causes beyond idiopathic Parkinson's disease.
• A comprehensive diagnostic approach is essential before classifying Parkinsonism as idiopathic.

Observation:

• A 31-year-old woman with a history of Graves disease presented with right-sided limb movement difficulties and tremor.
• Neurological examination revealed symptoms consistent with Parkinsonism, including bradykinesia and rigidity.
• Elevated plasma manganese levels were detected, normalizing after removal of the suspected exposure source.

Findings:

• Standard investigations for secondary Parkinsonism were unremarkable.
• Despite normalization of manganese levels, motor symptoms persisted until levodopa treatment was initiated.
• This case highlights a potential link between manganese exposure and Parkinsonism, responsive to dopaminergic therapy.

Implications:

• Emphasizes the importance of screening for environmental and toxic exposures in young-onset Parkinsonism.
• Suggests that manganese toxicity should be considered in the differential diagnosis of unexplained Parkinsonism.
• Underscores the potential efficacy of levodopa in managing Parkinsonism secondary to certain toxic exposures.