Lhermitte's sign (LS) is characterized by electric shock like sensation, spreading along the spine in a cervico-caudal direction and also into both arms and legs, which is felt upon forward flexion of the neck. It is a myelopathy resulting from damage to sensory axons at the dorsal columns of the cervical or thoracic spinal cord and a well-known clinical sign in neurology practice. Patients with cancer may present with LS due to various causes either related to the tumor itself or to its treatment. Spinal cord tumors, radiotherapy and chemotherapy are possible causes of LS observed in oncology practice. While LS is observed with a frequency of 3.6-13% in large patient groups receiving radiotherapy for head and neck and thoracic malignancies, the true incidence of chemotherapy and spinal cord tumor induced LS is unknown with only few reported cases in the literature. In the present article, various pathologies causing Lhermitte's sign are reviewed with special emphasis on the implications of this sign in oncology practice.
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