A patient was treated for mantle cell Hodgkin lymphoma with radiation therapy. After 6 months he develops an electric shock-like pain along the spine on flexing his neck. What is the diagnosis?

Disease Features Cervical Ahritis Presents with stiffness in neck muscles and reduced neck movements Lhermite Sign -Seen in cervical spinal cord pathology -When neck flexion produces an unpleasant electric shock sensation radiating down the extremities Uthoff Sign -Multiple sclerosis -Worsening of symptoms like fatigue, optic neuritis with an increase in body temperature. Spinal cord compression Presents with deficits like paraplegia, bladder and bowel involvement