Yu, 72, has been suffering from chronic dacryocystitis for more than 40 years, and in the past year her vision has been significantly reduced due to cataracts, making it almost impossible for her to see. If Yu’s dacryocystitis could not be cured, it meant that she could not undergo cataract surgery and her vision problem could not be solved. After Yu tried various treatments at the ophthalmology department, she was still unable to completely solve the problem of dacryocystitis. The hospital tried to cure Yu’s chronic dacryocystitis by performing a nasal endoscopic lacrimal sac nasal anastomosis (i.e. lacrimal sac rhinostomy), which is a minimally invasive procedure with short operating time and little bleeding. At present, Grandma Yu has been successfully discharged from the hospital and will be able to undergo cataract surgery again after a period of recuperation. The traditional method of treating lacrimal sacs is done by ophthalmologists through rhinocystorhinostomy, which is performed through the external nasal tunnel and affects the aesthetics of the skin on the side of the nose after surgery. The lacrimal sac nasal anastomosis that Yu performed is a nasal endoscopic lacrimal sac rhinostomy, which is performed without a wound on the face and directly anastomoses the lacrimal sac with the nasal mucosa, allowing secretions and tears to enter the middle nasal passage directly from the lacrimal sac to eliminate the purulent lesions of the lacrimal sac and to relieve the tear overflow phenomenon. The specific surgical approach is to open a new drainage channel between the lacrimal sac and the nasal cavity and use the new channel to solve the problem of tear overflow and pus accumulation in the lacrimal sac cavity caused by lacrimal obstruction, so this surgical approach has become a more ideal method for the treatment of chronic lacrimal sac inflammation. This procedure is most suitable for cases of chronic dacryocystitis where the nasolacrimal duct is obstructed and the lacrimal duct is normal, especially for those with large cystic cavities and normal nasal mucosa.