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:

  1. patient in the supine position
  2. similar projection to an OM view in most cases
  3. acquisition of a preliminary control film to confirm patient positioning and exposure
  4. dilate the punctum to insert the cannula
  5. non-ionic iodinated contrast injection into a cannulated duct, avoiding air bubbles
  6. acquire images, whilst ask the patient to look straight ahead to avoid blinking
  7. a post-removal of cannula erect view may be useful in diagnosing functional blocks

CT and MRI dacryocystography have also been described 1,2.

Article information

rID: 54829
System: Head & Neck
Section: Radiography
Synonyms or Alternate Spellings:
  • Dacryocystographs
  • Dacryocystographic
  • Dacryocystography (DCG)
  • Dacryocystogram
  • Dacryocystograms

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Cases and figures

  • Fig 1: normal dacryocystogram
    Drag here to reorder.