The most frequent variants are an anomalous curvature with the tip medially and downwardly oriented or the pneumatization of the uncinate process (up to
18% of subjects), the latter generally limited to the apex (uncinate bulla) (Boiger et al. 1991) (Figs. 2.2, 2.14). Seldom, a hypoplastic uncinate process, tightly
adjacent to the lateral nasal wall or fused to the inferior aspect of the orbital floor or to the lamina papyracea, narrows the ethmoid infundibulum (at-electatic infundibulum). As a consequence underde-velopment of the maxillary sinus is observed along with intrasinusal mucous retention. In addition, the hypoplastic maxillary sinus is associated with a lower-than-normal location of the orbital floor. This variant has to be noted because of the higher risk of orbital damage at surgery. More rarely, the uncinate process may be absent.
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