Multifocal motor neuropathy, type 1 diabetes and asymptomatic Hashimoto's thyroiditis: an unusual association.

Immune mediated mechanisms play a role in some forms of diabetic neuropathies. We studied a 17-year-old man who developed asymmetric weakness and atrophy in both upper arms soon after the diagnosis of type 1 diabetes. Nerve conduction studies demonstrated multifocal motor conduction blocks, and serological investigations revealed subclinical Hashimoto's thyroiditis.