Dacryocystogram by linear tomography with Omnipaque precisely helps us to determine the site of NLD block, stenosis of the excretory duct provide appropriate details for evaluating the diagnosis of diverticula, fistula or filling defects caused by stones and tumours.
Dacryocystogram is performed after explaining the procedure to the patient and obtaining informed consent.
A normal Dacryocystogram in the presence of epiphora indicates a mild incomplete anatomic block or physiologic dysfunction.
Dacryocystogram is also then carefully evaluated to assess the grade of reflux from the upper canaliculi, the size of the lacrimal sac in mm and the nasolacrimal duct calibre in mm and comments made on the presence of any filling defects or diverticula.
Dacryocystogram with digital subtraction radiography (4) can eliminate confusing bone shadows to identify the exact morphology of the sac outlined.
Dacryocystogram delineate the altered tract (Fistula) being external in 2 patients.
Based on Dacryocystogram finding, DCT was advised in maximum number of cases 55% followed by DCR 40% and excision of fistulous tract along with Dacryocystectomy was performed in 5% of them (Table 1).
Dacryocystogram is easy to perform, harmless and it provides good imaging quality at a much lower cost and radiation exposure is much lower than compared to CT scan.
Demorest and Milder (25) first introduced the term 'functional block' in 1955 and described a case that was clinically patent to nasolacrimal irrigation and had an abnormal dacryocystogram (moderately distended lacrimal sac and retention of dye).
This statement was based on the dacryocystogram being unlikely to detect an abnormality in patients with FNLDO.
A comparative study of contrast dacryocystogram and nuclear dacryocystogram.