Localized fibromyalgia in a child.

A 14-year-old male was investigated because of a limp and a localized sharp pain in the right lumber paravertebral region radiating to the lower abdomen and the medial aspect of the thigh, which started following forced physical activity. With the diagnosis of fibromyalgia the patient received two perifacetal injections of local anaesthetics with steroids followed by transcutaneous electrical nerve stimulation (TENS). Following the injections, pain intensity dropped dramatically, disability was reduced and muscle swelling resolved. The possible association of symptoms to sport activity raises the question of sport-induced fibromyalgia, and the excellent response to treatment may suggest a facet joint irritation as possible aetiology.