Australian Veterinary Practitioner | Volume 50 (2) June 2020 - Flipbook - Page 25
Resistance was met at a length of 25 mm.
A survey right lateral radiograph of the skull
was taken with the wire in place (Figure
2). The wire stopped at the junction of the
lacrimal and maxillary bones. This area
represents the narrowest portion of the
nasolacrimal duct.51 The wire was removed
and positive contrast dacryocystorhinography
was performed in right lateral recumbency.
Diatrizoate meglumine 37% (RenoCal-76,
Braco Diagnostics Inc., Monroe Township,
NJ, USA) was injected through a 24-gauge
lacrimal cannula that was placed in the
superior puncta OS.52 Both canaliculi were
apparent and well-delineated with contrast
radiographically (Figure 3). There was no
distinct lacrimal sac seen with positive
contrast. This was expected since the sac
is essentially vestigial in small animals.51,53
The nasolacrimal duct was seen emerging
Figure 2: Survey right lateral radiograph of skull with stainless steel wire placed in the superior punctum OS and passed to the junction of the
lacrimal and maxilla bones.
Figure 3: Radiograph of skull with positive contrast outlining both canaliculi OS, and continuation of the nasolacrimal duct rostrally to the level
of the maxillary bone.