A 65 year old male who has uncontrolled
hypertension presents with backache which is followed by weakness of his lower
limbs. On examination he is found to have a flaccid paraplegia with a sensory
level at T10 with sparing of the dorsal columns.
In this patient which of the following
investigations is likely to lead to a diagnosis?
Vitamin B12 levels
CT scan of the chest
Nerve conduction studies