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Case-controlAmerican journal of rhinology & allergy · 2026

Angular Variations of the Lateral Nasal Wall as Independent Predictors of Primary Acquired Nasolacrimal Duct Obstruction: A Computed Tomography Study.

Oğuzhan Dikici, Ismail Alkan, Osman Durgut … Malik Afifoğlu

OphthalmologyCase-control

Wider angle between tear-duct crest and nasal sidewall bone linked to tear-duct blockage

Angular Variations of the Lateral Nasal Wall as Independent Predictors of Primary Acquired Nasolacrimal Duct Obstruction: A Computed Tomography Study.

Oğuzhan Dikici … Malik Afifoğlu

American journal of rhinology & allergy · 2026

Background

The aim of this study was to investigate the relationship between specific sinonasal anatomical parameters and primary acquired nasolacrimal duct obstruction (primary acquired nasolacrimal duct obstruction) using paranasal sinus computed tomography (paranasal sinus computed tomography).

Methods

This retrospective case-control study included 42 patients with primary acquired nasolacrimal duct obstruction and 42 controls.

n = 42 patients

Results

Patients with blocked tear ducts had this nasal-bone angle averaging 4.04° wider than unaffected people on CT scans

MD 4.04 (95% CI 0.34 to 7.74)

CI excludes the null - significant

More results

Independent samples t -tests and Mann-Whitney U tests were applied based on data distribution.

Multivariate analysis identified both AMLC-UP (OR = 0.916, P = .007) and NB-LC (OR = 1.061, P = .030 (Control:1, primary acquired nasolacrimal duct obstruction:0)) angles as independent predictors of primary acquired nasolacrimal duct obstruction.

More results

An increasing AMLC-UP angle and a decreasing NB-LC angle were independently associated with higher odds of primary acquired nasolacrimal duct obstruction.

The logistic regression explained 14.6% of variance (Nagelkerke R 2 ) with an overall classification accuracy of 61.9%.

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Conclusion · 1 of 2

Subtle angular variations between the lacrimal crest, uncinate process, and nasal bone are independently associated with primary acquired nasolacrimal duct obstruction, suggesting that lateral nasal wall anatomy contributes to nasolacrimal duct patency.

Conclusion · 2 of 2

These findings may inform preoperative planning for endoscopic dacryocystorhinostomy.

Post

Angular Variations of the Lateral Nasal Wall as Independent Predictors of Primary Acquired Nasolacrimal Duct Obstruction: A Computed Tomography Study.

Wider angle between tear-duct crest and nasal sidewall bone linked to tear-duct blockage

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