PMC3379878_01
(A) An 18F-deoxyglucose positron emission tomography (PET) study with increased rest uptake in the medial posterior parietal lobe bilaterally seen in a patient with psychogenic tremor (arrows). (B) The corresponding areas of a 46-year-old patient with a history of essential tremor (ET) since the age of 10 years who developed Parkinson's disease (PD) 4 years ago. His clinical examination showed overlapping severe ET and tremor-dominant PD with rest tremor (right>left), and bilateral postural and kinetic tremor. We used the same PET protocol and he was in off state for his dopaminergic medications. Corresponding areas of the posterior parietal lobes showed no increased 18F-deoxyglucose uptake (arrows).
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The PET study revealed abnormally increased uptake in the medial aspects of posterior parietal lobes bilaterally (Figure 1).