Ophthalmology · Lacrimal System Disorders
The facts most likely to be tested
Congenital nasolacrimal duct obstruction is most commonly caused by failure of canalization of the Valve of Hasner at the distal end of the nasolacrimal duct.
The classic clinical presentation is chronic epiphora (overflow tearing) and matted eyelashes in an otherwise healthy infant.
Initial management for congenital cases is conservative with nasolacrimal sac massage (Crigler massage) and observation, as most cases resolve by 12 months of age.
Dacryocystitis is a serious complication characterized by erythema, edema, and tenderness over the lacrimal sac, often requiring systemic antibiotics.
In adults, acquired nasolacrimal duct obstruction is frequently secondary to involutional stenosis, chronic sinus disease, or nasal polyps.
The fluorescein dye disappearance test is a simple office screening tool where the persistence of dye in the tear film after 5 minutes indicates impaired drainage.
Surgical intervention via dacryocystorhinostomy (DCR) is indicated for persistent congenital obstruction beyond 12 months or for symptomatic acquired obstruction.
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A 6-month-old infant is brought to the clinic by his mother due to persistent tearing in the left eye. The mother notes that the eye often appears 'crusty' in the morning, but the infant has no fever, photophobia, or conjunctival injection. On physical examination, there is overflow tearing and matted eyelashes on the left side. Applying pressure over the lacrimal sac results in the reflux of clear mucoid material through the punctum. The conjunctiva is clear and the cornea is transparent.
What is the most appropriate initial management for this patient?
Nasolacrimal sac massage and observation
The patient presents with classic signs of congenital nasolacrimal duct obstruction; because the condition is self-limiting in most infants, conservative management with massage is the first-line treatment.
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Etiology / Epidemiology
Common in infants due to failure of the Hasner membrane to canalize; in adults, often idiopathic or secondary to nasal polyps.
Clinical Manifestations
Presents with chronic tearing (epiphora) and mucopurulent discharge; dacryocystitis is the classic infectious complication.
Diagnosis
Diagnosis is clinical, but the fluorescein dye disappearance test is the gold standard for confirming obstruction.
Treatment
Infants: nasolacrimal duct massage (Crigler maneuver); Adults: dacryocystorhinostomy (DCR) for persistent cases.
Prognosis
Most congenital cases resolve by 12 months; orbital cellulitis is a rare but severe complication.
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Epidemiology & Etiology
Congenital obstruction occurs in up to 20% of newborns due to incomplete canalization of the Hasner membrane. Adult-onset obstruction is frequently associated with chronic sinusitis, nasal polyps, or facial trauma. It is more common in elderly females due to age-related ductal narrowing.
Pertinent Anatomy
The nasolacrimal system drains tears from the lacrimal sac into the inferior meatus of the nose. The valve of Hasner is the distal-most portion of the duct, which is the most common site of congenital blockage.
Pathophysiology
Obstruction leads to stasis of tears within the lacrimal sac, creating a nidus for bacterial overgrowth. This stasis results in epiphora (overflow of tears) and potential secondary infection of the sac, known as dacryocystitis. Chronic inflammation can lead to fibrosis and permanent ductal stenosis.
Clinical Manifestations
Patients present with persistent tearing and matting of the eyelashes. If dacryocystitis develops, look for erythema, edema, and tenderness over the lacrimal sac. Red flags include fever, proptosis, or ophthalmoplegia, which suggest progression to orbital cellulitis.
Diagnosis
The fluorescein dye disappearance test is the gold standard; persistence of dye in the eye after 5 minutes indicates obstruction. A lacrimal irrigation test (syringing) can confirm the site of blockage. Imaging like dacryocystography is reserved for surgical planning.
Treatment
Congenital cases are managed with nasolacrimal duct massage (Crigler maneuver) and topical antibiotics for discharge. If persistent beyond 12 months, nasolacrimal duct probing is indicated. Adults with chronic symptoms require dacryocystorhinostomy (DCR) to create a new drainage pathway. Avoid systemic antibiotics unless there is evidence of systemic infection.
Prognosis
Over 90% of congenital cases resolve spontaneously by 1 year of age. Complications include recurrent dacryocystitis and chronic conjunctivitis. Patients should be monitored for signs of orbital cellulitis or abscess formation.
Differential Diagnosis
Congenital glaucoma: presents with photophobia, blepharospasm, and enlarged cornea
Nasolacrimal duct stenosis: partial obstruction rather than complete blockage
Dacryocystitis: acute infection characterized by purulent discharge and significant pain
Canaliculitis: inflammation localized to the canaliculi, often with 'sulfur granules'
Allergic conjunctivitis: bilateral itching and chemosis without ductal obstruction