Every one has so-called individual characteristics and definite susceptibilities to disease—susceptibilities which may be determined by endocrine or allergic reactions or by anatomic constitution and arrangements which make possible definite pathologic sequelae. In the respiratory, the cardiovascular, the gastrointestinal and the urinary system these susceptibilities are fairly well known, but the nose, the sinuses and the pneumatic temporal bone, although they may be considered adjuncts of the respiratory system, often present problems which are baffling and apparently not correlated with the patient's general constitution. Individual problems, then, arise in each case, and anatomic variations must be constantly kept in mind, even though they may not be extreme. Unusual anatomic arrangements which depart little from the so-called normal may place a nerve, an artery, a vein or a venous sinus in a vulnerable position. This abnormality may result in unusual or confusing symptoms, which may be interpreted accurately and correctly only