Ulnar mononeuropathy associated with eosinophilia.

A boy aged 4.5 years presented with isolated left ulnar nerve motor neuropathy and moderate eosinophilia. There was no evidence of parasitic infection. He was commenced on empirical diethylcarbamazine citrate and albendazole. Improvement occurred 6 days later with complete recovery by 2 weeks. It is presumed that he had a parasitic infection.