الفهرس 
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Abstract
Introduction: Acquired nasolacrimal duct (NLD) obstruction, typically presenting with epiphora and recurrent dacryocystitis, and is treated surgically by creating a fistula between the lacrimal sac and the nasal cavity, a procedure known as dacryocystorhinostomy (DCR) (Jawaheer et al., 2017). Statin treatment in association with physical exercise practice can substantially reduce cardiovascular mortality risk of dyslipidemic individuals. (Langlois et al., 2018). A powered endoscopic DCR is a suitable option for revising failed DCRs in which yields good long-term results. Inserting silicone tubes through the inferior and the superior puncta significantly improved the successful rate of revision DCR (O et al., 2010). The Aim of this study: This study aims for endoscopic revision of recurrent dacryocystitis after failed external or endoscopic DCR.It aims also to evaluate the outcome of endoscopic DCR for treatment of recurrent dacryocystitis after failed DCR. Materials and methods: This is prospective, interventional study involved patients with failed DCR who attended the Mansoura Ophthalmic Center in the period from July 2020 to June 2022. The study was performed in the Ophthalmology Department, Faculty of Medicine, Mansoura University after approval of both local ethical committee and institutional research board(IRB). Results: •The most prominent endoscopic finding was granulation tissue, deviated septum, and obstructed osteotomy. •The success rate achieved by revision endoscopy was 19/22 patients (86.4%), while only 3/22 cases (13.6%) had failure. The causes of failure were incomplete lacrimal sac medial wall removal, granulation tissue, and retained tube in two cases who underwent endoscopic DCR and narrow osteotomy in one case who underwent external DCR as a revision surgery. Keywords: Dacryocystorhinostomy , institutional research board.