Mechanical endonasal dacryocystorhinostomy with mucosal flaps.

Mechanical endonasal dacryocystorhinostomy (DCR) involves the creation of a large rhinostomy and the preservation of lacrimal and nasal mucosa. It replicates the main advantages of the external approach to DCR using minimally invasive techniques. A thorough knowledge of intranasal anatomy and the close collaboration of a multidisciplinary team are important when converting from the external to the endonasal approach.