Lacrimal Sac Anterior Border-Maxillary Line Distance: Effect on Endoscopic Dacryocystorhinostomy (EDCR) Surgery Results and NLDO-SS Questionnaire

This study aimed to investigate the effect of the maxillary line (ML)-lacrimal sac anterior border (LSA) distance on the results of endoscopic dacryocystorhinostomy (EDCR) operation. The study was designed retrospectively. The distance between LSA and ML was measured from preoperative paranasal sinus computed tomography (PNSCT) images. Nasolacrimal duct obstruction symptom score (NLDO-SS) was calculated before and after surgery. The endoscopically proven of the transition of the 2% fluorescein drop instilled into the eye to the nasal passage accepted as a surgical success. 47 patients included in the study and eight of them underwent bilateral EDCR. The average age of the patients was 50.3 ± 14.8. The LSA-ML distance was 4.2 ± 1.0 mm in all patients. The duration of surgery was found as 38.1 ± 6.1 min for each side. The preoperative NLDO-SS mean was 54.9 ± 11.7 and 22.2 ± 12.1 postoperatively (p = 0.000, CI = 28.9–36.2). Six patients (11%) required revision surgery. A statistically significant high positive correlation was found between duration of surgery and LSA-ML distance (p = 0.000, r = 0.840). There was a significant negative correlation between the duration of surgery and postoperative NLDO-SS (p = 0.041, r = −0.276). The LSA-ML distance calculated in this study was found to be significantly associated with the decrease in the duration of surgery and the NLDO-SS score obtained after surgery. However, more valid results can be obtained if similar studies are carried out in larger samples containing a sufficient number of revision cases.