. Roentgen interpretation; a manual for students and practitioners . imeter or two in diameter located in the mesial plane severalcentimeters above the mastoids. They are without significance. Sinuses.—For a proper study of the sinuses anteroposterior,lateral, and vertical projections are necessary. The anteroposteriorplate, in addition to the outline of the sinuses themselves, affords SINUSES 87 some evidence of the shape of the septum, size of the turbinates andrelative depth of the floor of the nose and the floor of the lateral plate is particularly useful in checking up the anter
. Roentgen interpretation; a manual for students and practitioners . imeter or two in diameter located in the mesial plane severalcentimeters above the mastoids. They are without significance. Sinuses.—For a proper study of the sinuses anteroposterior,lateral, and vertical projections are necessary. The anteroposteriorplate, in addition to the outline of the sinuses themselves, affords SINUSES 87 some evidence of the shape of the septum, size of the turbinates andrelative depth of the floor of the nose and the floor of the lateral plate is particularly useful in checking up the antero-posterior of the frontals to determine their depth and the thickness oftheir walls. Teeth or foreign bodies in the antra may be wellprojected in this view which often gives a clue to the condition ofthe sphenoidal sinus, but is of little value in the study of the vertical projection outlines the sphenoidal sinus very normal sinus, because of its air content and thin walls,appears as a more or less darkened area with sharply defined Fig. 62.—Sinusitis. All of the sinuses on the left side are dull. Any change in the amount of air contained within it or in the thick-ness of its walls will be recorded as a change in density on the plate,and both these factors must be considered in making a is particularly true in the case of the frontals, where a degree ofdensity which is normal for one individual may be quite pathologicalin the case of another whose air space is larger and walls thinnerand whose sinuses should therefore appear darker. For the recog-nition of pathology, it is essential to compare the two sides and tohave a fairly definite mental picture of the appearance of the normalsinus. In the study of the frontals both anteroposterior and lateralviews must be combined. 88 SKULL A general haziness with a sHght increase in density in one or moresinuses usually means thickening of the lining membrane. This maybe corroborated in t
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