volume reduction in initial PD compared with a group of participants without the disease in a neuroimaging study which concluded that brain stem damage may be the first identifiable stage of PD neuropathology. Positive Alpha-Synuclein staining of a Lewy body in a patient with Parkinson's disease.<unk>  refers to two methods used to classify the degree of pathology in Parkinson's disease and Alzheimer's disease. These methods are used both in research and for the clinical diagnosis of these diseases and are obtained by performing an autopsy of the brain.
Braak staging
Gleason grading system
Frykman classification
Herbert classification
Kauffman–White classification
Lauge-Hansen classification
Lidström classification
Nissen-Lie classification