Surgical and Anatomic Considerations in Endoscopic Revision of Failed External Dacryocystorhinostomy

Abstract

In this case series, a large proportion of patients who had failed an ExDCR had an agger nasi cell, suggesting that variability of the anterior ethmoid anatomy may contribute to surgical failure following ExDCR. CT imaging and endoscopy, which are not always performed prior to ExDCR, can help to elucidate the pattern of agger nasi pneumatization as it relates to the lacrimal fossa and to optimize placement of the DCR ostium.