What is the differences between essential tremor and atypical parkinsonism?

Tremor: The difference between the two ironically is tremor. Wereby essential tremor has a tremor, atypical parkinsonism such as that caused by progressive supranuclear palsy, corticobasilar degeneration and multisystem atrophy tend not to have tremor. Also, in parkinsonism the tremor is usually at rest. In essential tremor the tremor is noticeable with use.