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Byeong Jae Son; The Evaluation of Bony Nasolacrimal Duct in Asian with Primary Acquired Nasolacrimal Duct Obstruction. Invest. Ophthalmol. Vis. Sci. 2017;58(8):1745.
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© ARVO (1962-2015); The Authors (2016-present)
The bony nasolacrimal duct (BNLD) morphology as a contributory factor in primary acquired nasolacrimal duct obstruction (PANDO) is still controversial. The objectives of this study were to evaluate the morphometric differences of BNLDs in unilateral PANDO patients between PANDO and non-PANDO sides, as compared with the control group using multidetector computed tomography (CT).
Bilateral BNLDs in 50 unilateral PANDO patients and 50 control subjects were retrospectively reviewed. CT images with 1.0 mm thickness were obtained with a 64-slice scanner. The length, coronal & sagittal orientation angle of BNLD, relative lacrimal sac-BNLD angle, and inferior turbinate angle were assessed. The entrance, minimum and distal end transverse (TD) & anteroposterior (APD) diameters of BNLD was investigated. The distance between bilateral BNLD and frontozygomatic suture (FZS) in axial view were measured.
All measurements were not different between PANDO and non-PANDO sides within PANDO patients. The mean entrance and minimum BNLD TDs were significantly narrower in PANDO patients, both in PANDO and non-PANDO sides, as compared with the control group (p = 0.025 and p = 0.011, respectively). The mean coronal orientation angle of BNLD, relative lacrimal sac-BNLD angle, and inferior turbinate angle were significantly narrower in PANDO patients as compared with the control group. Narrower entrance BNLD TDs were significantly associated with decreased inter-FZS distance (p = 0.03), namely in patients with narrower faces.
The narrow mean entrance & minimum BNLD TD, coronal orientation angle of BNLD, and inferior turbinate angle in PANDO patients may be associated with PANDO development. Also, narrower inter-FZS distance, suggesting that a narrower face may be a possible causative factor in PANDO.
This is an abstract that was submitted for the 2017 ARVO Annual Meeting, held in Baltimore, MD, May 7-11, 2017.
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