Neck flexion induces an "electric shock" like sensation running down the back caused by a lesion in cervical cord in Multiple sclerosis is

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Lhermitte's sign is characterized by an electric shock-like sensation running down the back and into the limbs, and is often triggered by bending the neck forward. This symptom is associated with lesions in the cervical spine and is commonly seen in multiple sclerosis, among other conditions.

Neck Flexion Induces an "Electric Shock" Like Sensation Running Down