Abstract
In 1908 I1described a "lower half headache" (neuralgic) which seemed to be related to the nasal (sphenopalatine or Meckel's) ganglion. In those cases, there was almost always a recognizable lesion in the district in which the ganglion lay, and the symptoms could be relieved by cocainization of the ganglion. Later, I found that typical lower half headache could be present without such a lesion and could not be relieved by such treatment. These were cases of sphenoiditis, hyperplastic or suppurative and I believed that the headache was produced by irritation or inflammation of the nerves which supply the ganglion. Such lesions, of course, are situated central to the ganglion and naturally are not influenced by cocainization of it. Treatment of the sphenoid is successful for these lesions. CLINICAL PICTURE OF LOWER HALF HEADACHE This "lower half headache" when complete consists of pain about the eye, the upper jaw

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