Anterior Ethmoid Cells
During the development of ethmoid pneumatiza-tion, some cells may extend inferiorly and laterally to reach the medial orbital floor and the most inferior portion of the lamina papyracea, below the ethmoid bulla and lateral to the uncinate process (infraorbital ethmoid cells or Haller cells) (Fig. 2.15) (StackpolE and EdElStEiN 1997). When large in size, these cells may narrow the ethmoid infundibulum. Size and
morphology of the ethmoid bulla are also highly variable: this cell may dislocate the ethmoid infun-dibulum and uncinate process (horizontalized). This variant has been considered by some authors to predispose for recurrent maxillary sinusitis. However, the definitive relationship between the presence of this variant and recurrent sinusitis is still debated (Stammberger and Wolf 1988; Bolger et al. 1991; Laine and Smoker 1992).
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