RESUMEN
This article describes a technique of dacryocystectomy involving dissection within the subfascial plane, in which the lacrimal sac fascia is preserved and the orbital fat remains undisturbed. The lacrimal sac cavity was directly injected with Tisseel fibrin glue mixed with trypan blue. This led to sac distension and facilitated its separation from surrounding periosteal and fascial attachments. Staining the lacrimal sac epithelium improved definition of the mucosal lining. Transverse sections of the lacrimal sac specimen were histologically analyzed, which confirmed that dissection was completed within a subfascial plane. The technique herein described facilitates en bloc excision of the lacrimal sac without breaching the fascial plane that separates the sac from orbital fat.