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Venоus refilling time by phоtоplethysmogrаphy wаs 10 seconds without а tourniquet applied and 25 seconds with a tourniquet applied to the lower thigh. The diagnosis is:
A 67-yeаr-оld mаn with а 10-year histоry оf insulin-dependent diabetes mellitus awakened two days ago with weakness of the right leg. The patient has difficulty walking and states that he tripped while walking up the stairs to his home. He is also experiencing a funny sensation along the lateral aspect of his right leg. He denies arm weakness, speech difficulty, back pain, bladder or bowel dysfunction, and other neurologic symptoms. The general examination is normal. Neurologic exam is significant for 0/5 weakness of the right peronei, tibialis anterior, and extensor hallucis longus muscles. The other muscles of the right leg (iliopsoas, quadriceps, hamstrings, tibialis posterior, and gastrocnemius) are 5/5. There is no weakness of the left leg or either arm. Sensation to pain, temperature, and light touch is diminished over the lateral aspect of the right leg and medial aspect of the right foot. DTRs in the right upper and lower extremity are 2+ in the arms, 1+ at the knee, and 0 at the ankle; The patient walks with a right foot drop. The remainder of the neurologic exam, including palpation of the spine, is unremarkable. What is the most likely diagnosis?