SNCA and Lewy body dementia: Alpha-synuclein (αSyn) rich Lewy bodies (LB) and Lewy neurites (LN) constitute Lewy-related pathology (LRP), the hallmark of Lewy body diseases, including dementia with Lewy bodies (DLB) and Parkinson’s disease with (PDD) and without dementia (PD) [36, 49].