. X-ray manual : Army . s which keepup the discharge and prevent healing. HEAD, EXAMINATIONS 213 Interpretation of Accessory Sinuses. Here as in mastoids there are pneumatic cavitieswhich in a normal condition allow the rays to penetratereadily and cast dark shadows on the plate. Whenpathological material is present the density of theshadows is reduced depending on the extent of the in-volvement. Fig. 12. In the examination of the frontal sinuses a very im-portant factor to be considered is the depth of the sinusand the thickness of the anterior wall, as viewed in thelateral plate. A sinu
. X-ray manual : Army . s which keepup the discharge and prevent healing. HEAD, EXAMINATIONS 213 Interpretation of Accessory Sinuses. Here as in mastoids there are pneumatic cavitieswhich in a normal condition allow the rays to penetratereadily and cast dark shadows on the plate. Whenpathological material is present the density of theshadows is reduced depending on the extent of the in-volvement. Fig. 12. In the examination of the frontal sinuses a very im-portant factor to be considered is the depth of the sinusand the thickness of the anterior wall, as viewed in thelateral plate. A sinus with a thick wall will naturallycast a lighter shadow than the same sinus with a thinwall. Hence a sinus with a thin wall and con-taining granulations or thin pus will cast thesame density of shadow as the same size sinus witha thick wall but clear of pathological material. A deepsinus will normally cast a denser shadow than a shallowsinus. One must remember that one or both frontal sin-uses may be absent. Figs. 13 and 5 - a 3 ■s ° 214
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