Abstract
The number, size, and location of anterior ethmoidal air cells vary widely among individuals, although agger nasi cells vary least in this regard. By contributing to obstruction of frontal sinus drainage, the agger nasi cell may play a role in acute and chronic frontal sinus disease. Further, incomplete removal of this cell during ethmoidectomy may produce iatrogenic disease in a previously normal frontal sinus. This article presents anatomic, radiologic, and clinical information regarding the role of the agger nasi cell in the development and treatment of frontal sinus disease.
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