Abstract
Pyrethroids are widely used insecticides because of their high potency and relatively low toxicity to mammals.1 Symptoms of acute pyrethroid neurotoxicity in humans include numbness, dizziness, muscle fasciculations, and, in more severe cases, hypersalivation, seizures, and coma.1 Recently, 2 cases of partly or completely irreversible motor neuron disorder (MND) secondary to chronic pyrethroid inhalation were reported.2,3 We report a case of reversible MND and involuntary tongue movements (ITMs) secondary to transient pyrethroid overexposure. ### Case report. A 60-year-old farmer presented a 3-month history of slurred speech due to ITMs, preceded by a burning sensation of the tongue and palate associated with facial paresthesias. ITMs were continuous without any clear triggering or alleviating factor. The patient denied traumatic event, infectious episode, or neuroleptic intake. Family history was unrevealing. He reported a similar episode 2 years earlier that resolved spontaneously over a few months. He admitted having used type II pyrethroid insecticides (λ-cyhalothrin and cypermethrin) disregarding the recommended precautions. He regularly manipulated (about 10 times per year for …
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