Idiopathic small-fiber sensory neuropathy in childhood: A diagnosis based on objective findings on punch skin biopsy specimens.

Idiopathic small-fiber sensory neuropathy (SFSN) has not previously been reported in children. Although affected patients complain of neuropathic pain, this condition is often difficult to diagnose because of the few objective physical signs and normal nerve conduction studies. We report a girl with idiopathic SFSN in whom the results of a sural nerve biopsy were normal, but punch skin biopsy revealed reduced intraepidermal nerve fiber density and established the diagnosis. Idiopathic SFSN should be considered in the differential diagnosis of children who have burning limb pain with no routine electrophysiologic or pathologic abnormalities.