11. A 35-year-old HIV-positive man consults because of incre…

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11. A 35-yeаr-оld HIV-pоsitive mаn cоnsults becаuse of increasing difficulty walking over the last 6 months. He reports slowly increasing stiffness in his lower extremities that slowly became worse. He also noticed increasing urinary frequency and urgency over the last 6 months. On neurological examination, the patient displays mild paraparesis of lower extremities with spasticity and risk reflexes in the left knee and ankle, and bilateral Babinski sign. Sensory examination showed moderate loss of proprioception and vibration and normal sensation to pain. No sensory level. Cerebrospinal fluid analysis shows a protein level of 63 mg/dl, 5 WBC/mm3, 100% lymphocytes, and glucose 50 mg/dl. CSF viral and bacteriologic studies are normal. Vitamin B12 level is normal. MRI of the cervical, thoracic, and lumbar spine with gadolinium enhancement is normal. Somatosensory-evoked potentials show a prolongation of the central conduction time. The most likely diagnosis is

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