Figure 1
Posture of the right hand. Wrist and finger drop (A), incomplete “sign of the horn” (B), and normalization of hand posture (C). The “sign of the horn” represents an extension of the index and little fingers combined with weak or no extension of the middle and ring fingers.
Video 1
Neurological examination at the initial visit. Abnormal postures of the thumb, ring finger, and little finger, jerky movement of the right wrist, and subtle quick movement of the fingers at rest are visible on the right side.
Figure 2
Nerve conduction study of the right radial nerve. Compound muscle action potential (A) and sensory nerve action potential (B).
Video 2
Neurological examination on the following day. Abnormal posture of the right ring and little fingers is mild compared with that seen on the previous day.
Video 3
Neurological examination one month later. The neurological examination is unremarkable except for the brief abnormal posture of the right thumb during flexion of the right fingers.