“…The discharging duct may be identified before surgical excision by reviewing the diagnostic galactographic images, 4,6,8 staining with methylene blue dye, 2,3,5,9,10 or inserting a lacrimal probe or an endoscope into the duct immediately preoperatively. 7,10,11 Localization has been found to facilitate selective excision of the duct 9 and to increase the likelihood of finding a specific underlying abnormality.…”