[Anatomic variations in the ethmoid sinus in patients undergoing dacryocystorhinostomy at the Hassan II de Fès Medical Center (study of 215 patients)].

Introduction: Although several studies have tried to identify the causes of failure of dacryocystorhinostomy (DCR) surgery, the ethmoid sinus remains an underestimated and little described source of failure.

Objective: To study anatomical relationship between the ethmoidal sinus, particularly the "Agger nasi" cell, with the lacrimal fossa in the North African population, little described in the literature. This study is based on the results of preoperative analysis of dacryo-computed tomography.