La dacryo-cysto-rhinostomie par voie externe

The dacryo-cysto-rhinostomy via the external approach is indicated for obstruction of the lacrymal duct. It consists in the creation of short-circuit between the lacrymal sac and the external nasal wall. The operation stages starts by paracanthal incision, the subperiosteal dissection stops anteriorly to the posterior insertion of the medial canthal ligament (to preserve lacrymal function). An ostectomy is performed between the maxillary bone and the unguis. A stomy is created by individualizing two mucosal flaps. The bicanaliculonasal intubation is systematic and maintained for 10 to 12 weeks.