THE posteroanterior (Caldwell) view of the skull, like other views previously discussed, is an attempt to isolate as well as possible certain structures with a minimum of superimposition. This view is recognized chiefly for evaluation of the frontal and ethmoid sinuses.1-4 For the purposes of otolaryngology and maxillofacial surgery, a limited concept of the Caldwell view is not sufficient. Considerable orientation is necessary to evaluate the many secondary structures seen in this position which are not at all apparent on the three other standard views. These structures vary markedly with slight changes in the x-ray technique employed and in the various skulls examined.
During the past year we have reviewed over 1,000 sets of sinus and facial bone films. Each set contained, in addition to the posteroanterior (Caldwell view), the Waters', lateral, and base views. These films had been taken for either routine sinus or facial bone evaluation.
Yanagisawa E, Smith HM. Radiographic Anatomy of the Paranasal Sinuses: IV. Caldwell View. Arch Otolaryngol. 1968;87(3):311–322. doi:10.1001/archotol.1968.00760060313016
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