SNCA and Lewy body dementia: Similarly, a postmortem study of mild Lewy body disease cases found that patients with alpha-synuclein pathology in the olfactory bulb also showed mild amygdala-predominant Lewy pathology, while patients with Lewy body pathology in the peripheral autonomic nervous system and/or lower brainstem typically did not show such pathology in the olfactory bulb37.