Dacryocystography (DCG) is a fluoroscopic contrast examination of the nasolacrimal apparatus. The nasolacrimal duct is cannulated enabling iodinated contrast to be instilled into the nasolacrimal system.
The most frequent indication is epiphora: excessive tearing or watering of the eye(s).
Equipment is similar to that used to perform a sialogram.
One suggested technique:
- patient in the supine position
- similar projection to an OM view in most cases
- acquisition of a preliminary control film to confirm patient positioning and exposure
- dilate the punctum to insert the cannula
- non-ionic iodinated contrast injection into a cannulated duct, avoiding air bubbles
- acquire images, whilst ask the patient to look straight ahead to avoid blinking
- a post-removal of cannula erect view may be useful in diagnosing functional blocks
- 1. Eldesoky S, Farouk H, Moustafa AN, El-noueam K, Elsabaa A. The role of multi-detector CT dacryocystography in the assessment of naso-lacrimal duct obstruction. The Egyptian Journal of Radiology and Nuclear Medicine. 43(3): 397-405. 10.1016/j.ejrnm.2012.03.006 - ScienceDirect
- 2. Manfrè L, de Maria M, Todaro E, Mangiameli A, Ponte F, Lagalla R. MR dacryocystography: comparison with dacryocystography and CT dacryocystography. (2000) AJNR. American journal of neuroradiology. 21 (6): 1145-50. Pubmed