Abstract
Objective To collect various data of CT measurement of bony lacrimal canal and to explore the roles of anatomic factors in the genesis of primary nasolcarimal duct obstruction ( PNDO ).Methods The data of 64-slice spiral CT scans on 18 patients with PNDO and 88 healthy control subjects were retrospectively analyzed.Various data of bony lacrimal canal were measured in all the patients and control subjects.Results The narrowest part of the canal did not differ significantly between the patients and the control subjects [( 4.0 ± 1.1 ) mm vs.( 4.1 ± 1.0 ) mm,P ＞ 0.05].Conclusions 64-slice spiral CT scaning is a reliable method to measure bony lacrimal canal accurately.Narrow bony canal is not the only cause of primary nasolcarimal duct obstruction. Key words: Bony lacrimal canal; Computed tomography; Primary nasolacrimal duct obstruction
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