Step-by-step explanation:
Lhermitte’s sign is the sudden unpleasant electrical sensation running down the back and limbs when the neck is flexed .
The sign suggest lesions in upper cervical spinal cord.
Lhermitte’s sign suggests that the patient might have Transient radiation myelopathy
It is a form of myelopathy characterized by Lhermitte’s sign which results in unpleasant electric-shock sensation running down the extremities when the neck is flexed.
This sign is also present in some patients with multiple sclerosis and transverse myelitis.