case_images: PMC11049617_01
case_images: 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.
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case_images: PMC11049617_01_tohm-14-1-856-g1.jpg
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case_images: A 62-year-old right-handed man with a past medical history of hypertension noticed a hand and finger drop and shaking finger movements on his right side upon awakening one morning (Figure 1A). Thus, an incomplete "sign of the horn" was observed while the patient extended all of the fingers (Figure 1B). Within 2 weeks after symptom onset, the patient completely recovered with conservative management (Figure 1C).
case_images: 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.. 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.. 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.
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case_images: PMC11049617_01_.jpg
case_images: V1
case_images: A nerve conduction study revealed decreased amplitude of the right radial nerve compound muscle action potential (CMAP) recorded from EIP and a conduction block between the forearm and elbow (Figure 2A). The sensory nerve action potential (SNAP) of the superficial radial nerve was normal (Figure 2B).