Hemicrania continua evolving from migraine with aura: clinical evidence of a possible correlation between two forms of primary headache.

Hemicrania continua (HC) is an uncommon primary headache disorder originally described in 1984 by Sjastaad and Spierings (1) and characterized by a continuous, strictly unilateral headache of fluctuating intensity with exacerbations of more severe pain usually accompanied by autonomic disturbances such as conjunctival injection, lacrimation, nasal congestion, rhinorrhoea, ptosis, or eyelid oedema. Associated stabbing headaches have also been described. HC almost invariably has a prompt and enduring response to indomethacin (2). Remitting and unremitting forms have been identified (3). This entity has been included in the second revision of the International Headache Society (IHS) classification. Even though migrainous features can be part of HC, its relationship with migraine without or with aura has not been clarified. We report a case of remitting HC with absolute response to indomethacin evolving from migraine with aura.