JOURNAL ARTICLE
OBSERVATIONAL STUDY
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Prevention of re-obstruction in watery eye treatment: three-flap technique in external dacryocystorhinostomy.

PURPOSE: To examine the surgical outcome of three-flap external dacryocystorhinostomy (3-flap ex-DCR) based on the most common site of granulation occurrence in no-flap endonasal DCR (no-flap en-DCR).

METHODS: This was a retrospective observational study. We first examined the location of granulation occurrence in the osteotomy site using nasal endoscopy after no-flap en-DCR on 53 sides of 37 patients (5 male, 32 female) with nasolacrimal duct obstruction. Based on the results of this surgery, we performed 3-flap ex-DCR on 70 sides of 61 patients (18 male, 43 female) with nasolacrimal duct obstruction. Anatomical success was defined as no reflux under lacrimal irrigation and a patent osteotomy site under nasal endoscopic examination at postoperative 12 months. Functional success was defined as no symptoms of watery eyes over the same period.

RESULTS: In the no-flap en-DCR patients, the granulation was formed in 42 sides (79.2 %): 18 sides (34.0 %) on the superior portion, 9 sides (17.0 %) on the inferior portion, 35 sides (66.0 %) on the anterior portion, and only 1 side (1.9 %) on the posterior portion, which was very small. Based on these results, we performed the 3-flap ex-DCR with the anterior, superior, and inferior flaps. Anatomical success with this technique was achieved in all sides (100 %), and functional success was obtained in 66 of 70 sides (94.3 %).

CONCLUSIONS: The 3-flap ex-DCR did not cause recurrent nasolacrimal duct obstruction, rendering it a very useful technique in terms of quality of life and medical economics.

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