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McCormick A et al. - As in other studies women had narrower canals than men. Surprisingly we found no difference between New Zealand Maori and Caucasian. Unexpected was the larger diameter in Pacific People, as they have a higher incidence of dacryocystorhinostomy surgery. PANDO is likely to be of multifactorial aetiology and nasolacrimal canal diameter may not be a significant factor. Our described method of measuring canal diameter by CT scan is comparable to a cadaver study.