الفهرس 
Title : Anatomical Variation of Lacrimal Sac Fossa and Bony Nasolacrimal Duct among Adult Egyptians : Dry Boneand Radiological Study
ContantsOnly 14 pages are availabe for public view
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Abstract
Primary acquired nasolacrimal duct obstruction is an idiopathic condition. While the etiology is unknown, anatomical factors have been proposed (McCormick and Sloan, 2009; Lee et al., 2012). It has been associated with variations of morphometric characteristics of the fossa for lacrimal sac and the bony nasolacrimal duct. These variations are determined by the patient{u2019}s age, sex and race (Shigeta, 2007; Takahashi et al., 2013). It has been suggested that racial and sex differences in facial skull dimensions may explain narrower nasolacrimal ducts and therefore differences in the incidence of nasolacrimal duct obstruction (Wladis et al., 2005). The diameter of the nasolacrimal duct alone does not fully explain or predicttheoccurrence of primary acquired nasolacrimal duct obstruction