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 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.The maxillary sinus cysts usually obst