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)