Abstract
In the early part of this century the late Greenfield Sluder first directed attention to a syndrome which he called sphenopalatine ganglion neuralgia, or lower half headache. The novelty of this disease drew considerable attention, and the enthusiasm continued for several years, reaching a maximum in the early twenties. Then the interest subsided. The main reason, apparently, was that various bodily ailments, many quite remote, were attributed to irritation of the sphenopalatine ganglion. The syndrome had become a "dumping ground" for many otherwise undiagnosed conditions. This statement is easily substantiated by a glance at the literature of that period. As a result, many clinicians began to doubt the existence of the disease; and to this day some internists, neurologists and specialists in various other fields refuse to recognize the disease and to accept it as a reality. Textbooks more or less ignore the disease. Less than half of the otolaryngologic

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