A 62-year-old man presents with a 3-year history of progressive resting tremor (4–6 Hz, "pill-rolling"), cogwheel rigidity, and bradykinesia. MRI brain is unremarkable. Pathological examination of the substantia nigra reveals the structure marked A in the diagram—an eosinophilic cytoplasmic inclusion with a pale halo. Which of the following best describes the pathological composition and disease classification of this finding?

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