Nasolacrimal duct opening

The lacrimal system consists among others of a nasolacrimal duct which ends at inferior meatus. It is impossible to see it during the anterior rhinoscopy or nasal endoscopic examination, because it is hidden by the inferior turbinate and covered with mucosa (valve of Hassner). It will be possible to scar and cause a blockage of the duct resulting in epiphora (teary eye) if the opening is injured during the antral washout. In this video we can see clearly the nasolacrimal duct opening located superolateral to left inferior concha. Becasuse of the persistent hypertrophy secondary to allergic rhinitis not responding to medical therapy, the inferior turbinectomy was performed earlier. The nasal septum is deviated to the left. (S-nasal septum, MT- middle turbinate, IC- inferior concha with mucosal cover, N- nasopharynx, IM- inferior meatus, green arrow- nasolacrimal duct opening)