RT Journal A1 DUVOISIN RC, PARKER GW, KENOYER WL T1 THe cluster headache JF Archives of Internal Medicine JO Archives of Internal Medicine YR 1961 FD November 1 VO 108 IS 5 SP 711 OP 716 DO 10.1001/archinte.1961.03620110051008 UL http://dx.doi.org/10.1001/archinte.1961.03620110051008 AB Within the group of vascular headaches there stands out a "particular variety of headache"1 characterized by a severe throbbing periorbital pain frequently accompanied by lacrimation, conjunctival injection, and nasal congestion. The symptoms are unilateral, abrupt in onset, brief in duration, and appear consistently on the same side. Attacks recur often, usually daily, for a period of one or two months and then subside to return only after an interval of months or years, thus pursuing a time pattern which has suggested the descriptive term "cluster headache."2,3The literature contains numerous accounts of this type of cephalgia, under a variety of terms including Sluder's headache, sphenopalatine neuralgia,4 periodic migrainous neuralgia,5 Harris's neuralgia,6 ciliary neuralgia,7 erythromelalgia of the head,8 histamine cephalgia,9 Horton's headache, autonomic facial cephalgia,10 greater superficial petrosal neuralgia,11 and "red migraine."12 Corresponding and divergent concepts of the nature, etiology,