Lacrimal scintigraphy in the diagnosis of epiphora

Clinical value of dacryoscintigraphy using a simplified analysis

“…Hanna et al compared results of syringing with the findings on dacryoscintigraphy, and found scintigraphic clearance abnormalities in 65% of patients who had patency on syringing, as well as normal clearance in 18% of patients with obstruction at syringing [7]. Similar observations were reported by Rose et al, who compared dacryocystography with scintigraphy and found better sensitivity (77% vs 51%) for scintigraphy.…”

“…In addition, the sum of all three time-activity curves did not equal 100% during the entire study in many cases, even after correcting for resorption of radioactivity (see below). We also observed the unexpected and sudden variations in lacrimal sac and nasolacrimal duct activity that have been frequently described in other studies and may be related to active emptying of the lacrimal sac [7]. Therefore, we decided to focus only on the disappearance curve from the conjunctival sac, which minimizes the ROI definition issue and leads to the most reliable curves.…”

Canine dacryolithiasis: a case description and mineral analysis

“…Subsequently, an intermittent swelling of the medial canthus was reported by the owner prior to the development of a nonreducible mass. An iatrogenic cause for the cyst was unlikely as the presence of a diverticulum of the inferior canaliculus would have been bypassed by the irrigating cannula used for flushing of the nasolacrimal system by the referring veterinarian 11,31 …”

The role of “after washing imaging” in evaluation of tear drainage system by dacryoscintigraphy

“…Syringing and dacryocystography have been used for this reason and could show abnormal lacrimal ducts, as compare to these techniques, nuclear dacryoscintigraphy is a non-invasive and functional imaging modality for evaluating tear flow drainage under physiologic conditions with higher sensitivity [9,10].…”