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AJNR - American Journal of Neuroradiology

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Diameter of the Bony Lacrimal Canal: Normal Values and Values Related to Nasolacrimal Duct Obstruction: Assessment with CT

Alfred G. Janssen^,a, Khaled Mansour^a, Johanna J. Bos^a and Jonas A. Castelijns^a

^a From the Department of Diagnostic and Interventional Radiology, De Tjongerschans Hospital, Heerenveen, the Netherlands (A.G.J.); the Department of Ophthalmology, Academic Hospital, University of Groningen, the Netherlands (K.M.); the Department of Medical Informatics, Groene Land Verzekeringen, Zwolle, the Netherlands (J.J.B.); and the Department of Radiology, Free University Hospital, Amsterdam, the Netherlands (J.A.C.).

View larger version (15K): [in a new window]   FIG 1. Graph shows the normal distribution of minimum diameters of the bony lacrimal canal (in mm) for the 50 men and 50 women (200 eyes) in the control group

View larger version (14K): [in a new window]   FIG 2. Scatterplot shows the minimum diameter of the bony lacrimal canal versus age in the 100 subjects (200 ducts) in the control group. No correlation was found

View larger version (10K): [in a new window]   FIG 3. Scatterplot shows the minimum diameter of the bony lacrimal canal of 24 obstructed lacrimal duct systems versus age in the 19 patients with PANDO. A negative correlation was found between age and diameter

View larger version (86K): [in a new window]   FIG 4. Lateral skull radiograph. A metal bar in the bony lacrimal canal indicates the angle of the canal and the axial plane, which runs more or less parallel to the nasal floor. The metal bar is resting on the nasal floor. FIG 5. Axial CT scan, 2-mm-thick, of an adult male from the control group shows the bony lacrimal canals. The minimum diameter is 4.5 mm on the right side (A–B) and 3.6 mm on the left side (C–D)