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Occipital Nerve Block Rapidly Eliminates Allodynia far from the Site of Headache: A Case Report

Seventy to 80% of persons with migraine develop allodynia during the course of a severe attack (1). During a migraine attack, allodynia spreads topographically to extratrigeminal territory (1, 2). Dynamic mechanical allodynia, otherwise known as brush allodynia (BA), is a subtype of allodynia that is easily tested. Ashkenazi & Young (3, 4) recently reported on the immediate benefits of greater occipital nerve (GON) block on brush allodynia and pain in migraine and in cluster headache. In these studies, testing was performed at fixed sites in the trigeminal and cervical distributions. Allodynia in thoracic dermatomes was not studied.