Female, 64 year old referred to evaluate ocular dryness. Scintigraphy early (10 min) and delay (30 min) frames, shows  excellent contrast of palbebral space,  the lacrimal and nasolacrimal sac and elimination  into the pharinx. Soft massage in the inner area to the caruncle was performed at 20 min.

            Dacryoscintigraphy  is a low-radiation-dose method for evaluation under physiologic conditions. It is used to demonstrate patency of the excretory system and to localize the area of obstruction, wich can be used for surgical planning and for postsurgery followup. The results based on tracer disappareance from the eyes ( high activity at 1 min- T1- and slow clearance over 15 min) have adequate sensitivity and specificity: 77/95% for T1 and 71/100% for linear clearance rate  (1).

References:

1.- P.L.Jager et al. Clinical value of dacryoscintigraphy using a simplified analysis. Graefe‘s Arch Clin Exp Ophthalmol 2005; 243:1134-1140.
2.- McDonald A.. Burrell S. Infrecuently Performed Studies in Nuclear Medicine: Part 1  Journal of Nuclear Medicine Technology 2008;Vol 36- No 3: 132-143.