Dacryocystitis & Nasolacrimal Duct Obstruction

Tears drain from the ocular surface through the puncta, canaliculi, lacrimal sac, and nasolacrimal duct into the inferior meatus of the nose. Nasolacrimal duct obstruction (NLDO) is blockage anywhere along this system, most often at the duct itself, causing chronic epiphora and predisposing the stagnant tear column to secondary infection — dacryocystitis, infection/inflammation of the lacrimal sac.

Obstruction causes tears to stagnate in the lacrimal sac, creating an environment for bacterial overgrowth and infection. Cicatricial change within the duct — from prior inflammation, infection, or structural narrowing — is a key factor associated with reduced success of minimally invasive recanalization, since scar tissue resists simple mechanical widening or stenting compared with membranous or mucoid obstruction.¹ Rarely, a mass lesion within the lacrimal sac or duct itself causes obstruction and a dacryocystitis-like presentation.³

Chronic NLDO presents with persistent epiphora and expressible mucoid discharge on sac pressure. Acute dacryocystitis presents with painful, erythematous medial canthal swelling, sometimes with fluctuance or fever. A minority of lacrimal drainage apparatus lymphoma cases were detected incidentally at elective DCR performed for presumed simple NLDO.³

Key differentials: congenital NLDO in infants (usually self-resolving), canalicular obstruction/punctal stenosis, ocular adnexal lymphoma or other neoplasm (a critical masquerade), and preseptal/orbital cellulitis from another source.

Diagnosis combines clinical exam (punctal regurgitation on sac pressure), lacrimal irrigation to confirm level/completeness of obstruction, and dacryoendoscopy to directly visualize obstruction character and location (membranous, cicatricial, dacryolith, or diffuse).¹ Imaging is reserved for atypical presentations or suspected mass lesions.

Dacryocystorhinostomy (DCR) — external or endoscopic — is definitive treatment for chronic NLDO and recurrent dacryocystitis. Endoscopic DCR offers outcomes comparable to external DCR with appropriate technique.² In a tertiary cohort, primary endonasal DCR achieved 78.3% patency at six months, with diabetes mellitus and deviated nasal septum both significantly associated with failure, and combined risk factors compounding risk.² For complete NLDO, dacryoendoscopy-aided silicone tube intubation showed numerically similar but not statistically significantly different success rates versus endoscopic DCR (84.6% vs. 91.2% at 3 months), with cicatricial change the key factor reducing intubation success — supporting intubation as reasonable in appropriately selected patients while favoring DCR for cicatricial obstruction.¹

• Punctal regurgitation of mucoid material on sac pressure is a classic bedside sign of NLDO/dacryocystitis
• Diabetes mellitus and deviated nasal septum are significant, potentially synergistic risk factors for DCR failure²
• Cicatricial duct change predicts reduced success with less invasive recanalization, favoring DCR¹
• Endoscopic DCR achieves outcomes comparable to external DCR while avoiding a visible scar²
• A lacrimal sac mass or atypical presentation should always raise suspicion for neoplasm³
• Common pitfall: assuming all chronic epiphora with a medial canthal mass is simple obstruction