A rare cause of nasolacrimal duct obstruction: Dentigerous cyst in the maxillary sinus
The most common abnormality of the lacrimal drainage system is congenital or acquired nasolacrimal retroflag gpi case 2 deluxe edition duct obstruction.The causes of acquired nasolacrimal duct obstruction may be primary or secondary.The secondary acquired obstructions may result from infection, inflammation, neoplasm, trauma or mechanical causes.Th