Advances in CT-based anatomical parameters of nasolacrimal duct in nasolacrimal duct obstructive diseases

Nasolacrimal duct obstructive disease is a common ophthalmological disease with high clinical incidence. It is caused by inflammation or other reasons that nasolacrimal duct obstruction is partially or totally impassable. The main manifestation is epiphora. Secondary dacryocystitis can cause pyorrhea and secondary dacryocyst cyst can lead to enlargement of lacrimal sacand swelling of inner canthus. Opening obstructive nasolacrimal duct is the key to treat nasolacrimal duct obstructive disease. Tract-related anatomical parameters are very important in the diagnosis and treatment of nasolacrimal duct obstructive diseases. CT is one of the common methods of imaging examination of lacrimal duct, which is convenient for measuring the relevant anatomical parameters of nasolacrimal duct. This article reviews the research progress of CT measurement of nasolacrimal duct related anatomical parameters in nasolacrimal duct obstructive diseases in recent years, including the length and width, area, volume and angle of nasolacrimal duct and lacrimal sac, and summarizes the correlation between related anatomical parameters and nasolacrimal duct obstructive diseases in order to better guide clinical practice.