NDLI: CT assessment of the nasolacrimal canal in a black African Population.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Fasina, Oluyemi Ogbole, Godwin I.
Spatial Coverage	Nigeria
Description	Country affiliation: Nigeria Author Affiliation: Fasina O ( Department of Ophthalmology, College of Medicine, University of Ibadan, Ibadan, Nigeria. yemifash2000@yahoo.com)
Abstract	PURPOSE: Black Africans had been identified to have a lower prevalence of primary acquired nasolacrimal duct obstruction (PANDO). This has been attributed to the likely larger size of the nasolacrimal canal. However, there is paucity of studies that have quantitatively measured the dimension of the nasolacrimal canal in a homogeneous black population. The objective of this study was to determine the diameter of the bony nasolacrimal canal by CT in a normal adult Nigerian population. METHODS: The authors measured the minimum CT diameter of the bony nasolacrimal canal in 401 consecutive eligible adult patients using retrospective axial CT scans obtained between January 2006 and December 2010. The measurements were taken on axial images using a preset bone window algorithm on a standalone computer workstation with a ClearCanvas viewer (width: 2500, level: 480). The software calipers could measure up to a tenth of a millimeter. RESULTS: The CT images were made up of 378 cranial scans and 23 scans of paranasal sinuses. There were 286 male patients and 115 female patients aged 16 to 86 years with a mean age of 48.5 ± 18 years. The mean difference in nasolacrimal canal diameter of 3.52 mm in male patients and 3.36 mm in female patients was found to be statistically significant (t = 2.238, df = 400, p = 0.026). There was no significant difference in the canal diameter across age groups. In addition, there was no significant difference in the diameter between the right and left sides in the authors' study population (t = 1.551, df = 400, p = 0.122). CONCLUSIONS: The mean bony nasolacrimal canal diameter as measured by CT in Nigerians is smaller than those reported in African Americans, Asians, and Caucasians despite the reported lower prevalence of PANDO among blacks.
File Format	HTM / HTML
ISSN	07409303
Issue Number	3
Volume Number	29
e-ISSN	15372677
Journal	Ophthalmic Plastic and Reconstructive Surgery
Language	English
Publisher	Lippincott Williams & Wilkins
Publisher Date	2013-05-01
Publisher Place	United States
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Ophthalmology Discipline General Surgery African Continental Ancestry Group Nasolacrimal Duct Paranasal Sinuses Adolescent Adult African Americans Aged Aged, 80 And Over Asian Continental Ancestry Group European Continental Ancestry Group Female Humans Male Middle Aged Nigeria Organ Size Reference Values Retrospective Studies Tomography, X-ray Computed Young Adult Comparative Study Journal Article
Content Type	Text
Resource Type	Article
Subject	Ophthalmology Surgery

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