MRCP2-3346

A 72-year-old man comes in with left sided claw hand, right sided foot drop, right sided abducens palsy, and a loss of sensation over the back of the right forearm. His ESR is 70 mm per hour (0-20) and he has neutrophilic leukocytosis. Primary axonopathy is revealed in nerve conduction studies. What is the most probable diagnosis?