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Re-emergent tremor in Parkinson disease

This man with Parkinson disease has a coarse resting tremor that subsides when he raises his arms. The tremor reappears with a latency of about 10 seconds while the arms remain outstretched. This re-emergent tremor has characteristics of a resting tremor including frequency and should be differentiated from the postural tremor of essential tremor, which occurs without any latency (Jankovic 2016; Mailankody et al 2016; Ayturk et al 2017). (Contributed by Dr. Joseph Jankovic.)