When asymmetric rigidity and apraxia are present together, especially with alien limb phenomena, broaden the differential beyond idiopathic PD to include corticobasal degeneration and avoid prolonged empirical levodopa trials when atypical features are clear. In parkinsonism with occupational or environmental exposure history, obtain MRI specifically to assess the globus pallidus for toxic deposition.

Realistically, we do not have an effective disease-modifying treatment; Functional scans reveal a global reduction in cerebral metabolic activity, combined with a significant decrease in dopaminergic tracer uptake localized within both the caudate and the putamen; Standard dopaminergic agents offer minimal to no real clinical benefit, and other experimental therapies have unfortunately been quite disappointing; Rigidity is characteristically asymmetric, typically striking one specific limb far worse than the others, and it is frequently accompanied by fixed dystonic posturing and cortical sensory deficits; Rare, progressive neurodegenerative disorder defined by a highly asymmetric clinical presentation of structural rigidity and apraxia, often referred to as the PARA syndrome