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7%. Cases with both PSP and PD pathologically had reduced sense of smell similar to PD alone (N = 7). Hyposmic PSP patients had significantly higher Lewy body burden not meeting criteria for additional PD/DLB diagnosis. Pathologically confirmed PD had reduced olfaction compared with PSP or controls. In the setting of parkinsonism in this sample, the presence of normosmia had high sensitivity for PSP. Hyposmia in PSP suggests the presence of additional Lewy body pathology. © 2021 International Parkinson and Movement Disorder Society. Pa