Background:
Orthostatic tremor (OT) is a high-frequency tremor (13-18 Hz) present in the legs when standing. Underlying disease is found in one-third of OT patients.
Case report:
We describe an 86-year-old man with progressive shaking of the legs while standing, which disappears immediately after sitting down or while walking. Polymyography confirmed a tremor of the legs (10-11 Hz) while standing. Magnetic resonance imaging (MRI) and neurologic examination showed no underlying disease.
Discussion:
Primary OT can appear at a lower frequency of 10-11 Hz.