 The patient is a 55-year-old gentleman who presents for further evaluation of right leg weakness.  He has difficulty recollecting the exact details and chronology of his problem.  To the best of his recollection, he thinks that about six months ago he developed weakness of his right leg.  He describes that he is reaching to get something from a cabinet and he noticed that he was unable to stand on his right toe.  Since that time, he has had difficulty pushing off when he walks.  He has mild tingling and numbness in his toes, but this has been a chronic problem and nothing new since he has developed the weakness.  He has chronic mild back pain, but this has been persistent for many years and has not changed.  He has experienced cramps in both calves for the past year.  This dissipated about two months ago.  He does not think that his left leg is weak.  He does not have any bowel or bladder incontinence.  There is no radicular pain.  He does not think that the problem is progressive, meaning that the weakness that he perceives in his right leg is no different than when it was six months ago.