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
  • CT and MRI dacryocystography have also been described .

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