Alternative conditions to Parkinson's disease (PD) accounting for some of the scans without evidence for dopaminergic deficit (SWEDD) cases
| Condition(s) | References |
|---|---|
| Essential Tremor | 14 |
| Dystonia (including monogenic forms) | 8 9 15 21 23–27 46 |
| Fragile X premutation | 28 29 |
| Iatrogenic/Tardive | 30–32 |
| Symptomatic (vascular/brain neoplasm, toxic) | 33–37 |
| Psychogenic | 38 39 |
| Supranigral parkinsonism | 40 |
| Soft extrapyramidal signs of the elderly | 14 |