Presentation of CaseA 36-year-old, right-handed man was admitted to the hospital because of seizures and severe hypertension.The patient had an 18-year history of intravenous drug abuse, including abuse of heroin and cocaine with needle sharing. One year before admission, he discontinued his use of illicit drugs and began to feel vaguely unwell. Three months before admission, tingling developed in the left toes and progressed to numbness in the foot; these symptoms were accompanied by recurrent vomiting, night sweats, intermittent diarrhea, abdominal pain, subjective fever, and a weight loss of 16 kg. He noted erythematous lumps over the shins . . .