Obstruction Nasolacrimal Duct Workup
- Author: Jorge G Camara, MD; Chief Editor: Hampton Roy Sr, MD more...
Laboratory Studies
- Send lacrimal discharge for the following studies (depending on suspected etiologies):
- Gram stain/Giemsa stain
- Cultures and sensitivities
- KOH (suspected fungal infection)
- Anticytoplasmic antibodies (Wegener granulomatosis) - Monitor disease activity
Imaging Studies
- Dacryocystography
- Visualization of anatomic details of the lacrimal drainage system using contrast material
- Visual localization of the site of obstruction may help determine the surgical plan.
Dacryocystogram. A patent nasolacrimal system on the right side of a patient and a blocked system on the contralateral side at the level of the nasolacrimal duct.
- Dacryoscintigraphy
- More sensitive and less invasive method of lacrimal system imaging
- More sensitive for incomplete blocks of the upper drainage system
- Functional lacrimal duct obstruction is easily diagnosed with dacryoscintigraphy. It may be classified by types of obstruction to predict postoperative results of silicone tube insertion.
- Class I - Delayed secretion in the distal nasolacrimal duct
- Class II – Delayed secretion in the proximal nasolacrimal duct
- Class III - Delayed secretion from the prelacrimal sac to the lacrimal sac
- Prelacrimal sac obstructions, in particular, may achieve better operative results with adjuvant treatments in addition to silicone tube insertion.
- Does not provide as much detailed anatomic imaging as contrast DCG
- Computed tomography scan
- Use if suspecting traumatic, neoplastic, or mechanical causes of obstruction
- Useful for diagnosis and preoperative surgical planning
- Computed tomographic dacryocystography (CTDCG)[10]
- Axial plain computed tomography (CT) scan, followed by administration of water-soluble contrast in the conjunctival cul-de-sac or by cannulation of the lacrimal passages
- Safe and useful for diagnosing lacrimal system blocks and medial canthal masses
- Can evaluate dacryocystorhinostomy failures before re-operation[11]
- Nasal endoscopy - Used for postoperative evaluation of dacryocystorhinostomy and for dacryocystorhinostomy using the endonasal approach
- Gadolinium-enhanced magnetic resonance dacryocystography
- The overall sensitivity of magnetic resonance (MR) in detecting obstruction was 100%. MR helped to determine the canalicular and ductal obstruction in 100% of patients and the saccular obstruction in 80% of patients.
- The authors of this study concluded that three-dimensional (3D) fast spoiled gradient-recalled (FSGR) technique for MR dacryocystography is a reliable and noninvasive method in the evaluation of the obstruction level in the lacrimal system in patients with epiphora.[12]
Other Tests
- Tear production measurement to rule out tear deficiency or instability as the cause of possible reflex tearing
- Schirmer test
- Without topical anesthetic (stimulated tear production): Normal measurement is 10-30 mm wetting of Schirmer strip after 5 minutes.
- With topical anesthesia (basic secretion): Normal measurement is greater than 5 mm of wetting of Schirmer strip paper after 5 minutes.
- Tear break-up time test to rule out tear instability: Normal break-up time is 15-30 seconds. A time of 10 seconds or less is considered distinctly abnormal.
- Fluorescein dye disappearance test
- A positive result is indicated by +2 to +4 residual fluorescein 5 minutes after instillation.
- Positive results indicate a partial or complete obstruction, or pump failure.
- This test is simple and effective as a screening tool.
- The shortcomings are inability to distinguish between physiologic and anatomic causes of drainage dysfunction, inability to distinguish between upper and lower abnormality, and false-positive results.
- Lacrimal irrigation
- Reflux of irrigating fluid in the opposite/upper punctum demonstrates patency of the canalicular system but suggests obstruction in the distal drainage system.
- Lacrimal irrigation occasionally may be therapeutic by dislodging an obstructing stone or concretion or widening a partially stenosed passage.
- Rarely, adult patients are completely relieved of symptoms after nasolacrimal probing and irrigation; others are only relieved temporarily or not at all.
- Probing of canaliculi
- When the irrigation test indicates obstruction, probing is used in an attempt to palpate or localize the site of obstruction.
- The location of canalicular obstruction may be located, or the degree of stenosis may be estimated.
- Jones dye tests
- Jones I: Dye is instilled in the patient's eye, and the patient is asked to blow his or her nose after 5 minutes.
- Presence of dye indicates a patent system and normal physiologic function.
- Absence of dye indicates 3 possibilities: false-negative result, physiologic dysfunction, or anatomic obstruction.
- Jones II: The patient’s lacrimal drainage system is irrigated after a negative Jones I, and the patient is asked to expel any drainage from his or her pharynx.
- Presence of dye indicates a partial block at the lower sac or duct
- Presence of saline indicates punctal or canalicular stenosis
- Regurgitation indicates complete NLDO or complete common canaliculus block.
- High level of false results from Jones test
- Jones I: Dye is instilled in the patient's eye, and the patient is asked to blow his or her nose after 5 minutes.
- Microreflux test
- Screening test for PANDO
- Positive test - Reflux of fluorescein-stained tears from the inferior punctum after counterclockwise lacrimal sac massage
- Sensitivity of 97%
- Specificity of 95%
- Hornblass saccharine test
- Instill saccharine drops in one eye and chloramphenicol eye drops in the other eye several minutes later.
- The ability of the patient to detect the sweet taste of the saccharine and the bitter taste of the chloramphenicol denotes a patent lacrimal system.
- False-negative results are possible.
Histologic Findings
A study presented clinicopathologic findings from lacrimal sac biopsy specimens obtained during dacryocystorhinostomy (DCR).[13]
Their data revealed the following, in decreasing order of frequency: nongranulomatous inflammation (85.1%); granulomatous inflammation consistent with sarcoidosis (2.1%); lymphoma (1.9%); papilloma (1.11%); lymphoplasmacytic infiltrate (1.1%); transitional cell carcinoma (0.5%); and single cases of adenocarcinoma, undifferentiated carcinoma, granular cell tumor, plasmacytoma, and leukemic infiltrate.[13]
They concluded that nongranulomatous inflammation consistent with chronic dacryocystitis is the most common diagnosis in lacrimal sac specimens obtained at DCR.[13] Neoplasms resulting in chronic nasolacrimal duct obstruction occurred in 4.6% of cases and were unsuspected before surgery in 2.1% of patients.[13]
Dacryocystitis of the left nasolacrimal system. Staging
Diagnostic canalicular irrigation can determine the level of canalicular obstruction.
- Partial obstruction - Partial fluid flow into the nose, partial reflux
- Total common canalicular obstruction – Flow from the lower to the upper canaliculus with no flow into the nose
- Total functional occlusion – Partial obstruction under normal physiologic conditions
- Complete nasolacrimal obstruction – Fluid flow into the nose with mucoid reflux
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