Answer
The diagnosis for the elderly man with the nervous tremor is Parkinson's disease (Parkinsonism).
Work Step by Step
This patient sows all the classical signs of Parkinson's disease:
1. Tremor of a limb at rest
2. Stony facial expression
3. Difficulty in initiating muscular movements
Note. Many patients with this condition also walk with a shuffling gait, and in general, execute movements slowly.
