A tender lump at the inner corner of the eye is rarely just a swollen lymph node — it is usually a blocked drainage system turning infected.
Dacryocystitis is inflammation of the lacrimal sac, and it almost always begins with an obstructed nasolacrimal duct.
Tears that cannot drain normally stagnate, and stagnant fluid in a warm, enclosed space eventually becomes infected.
The result is a painful, swollen medial canthus that is frequently mistaken for a simple skin infection or an insect bite.
Untreated, it can progress to orbital cellulitis or, in the most severe cases, a lacrimal sac abscess that ruptures through the skin.
Recognizing the classic location and appearance, treating the acute infection promptly, and addressing the underlying obstruction afterward is the standard path to resolution.
What Is Dacryocystitis?
Dacryocystitis is infection and inflammation of the lacrimal sac, the reservoir that collects tears before they drain into the nose through the nasolacrimal duct.
It is classified by course and by age of onset:
- Acute dacryocystitis — sudden, painful, erythematous swelling over the lacrimal sac, sometimes with abscess formation
- Chronic dacryocystitis — persistent low-grade inflammation, tearing, and discharge without the dramatic acute presentation
- Congenital dacryocystitis — infection of a congenitally obstructed nasolacrimal duct in infants, sometimes presenting as a dacryocystocele
Almost all cases share the same underlying mechanism: an obstructed nasolacrimal duct upstream of the infected sac.
Epidemiology
Dacryocystitis occurs across the age spectrum but shows two characteristic peaks.
- It is more common in older adults, related to age-related narrowing of the nasolacrimal duct
- A distinct congenital form occurs in infants from incomplete canalization of the distal nasolacrimal duct
- It is reported more frequently in women, likely related to a narrower nasolacrimal duct anatomy
- Secondary causes — trauma, nasal pathology such as a deviated septum, tumors, or prior sinus disease — account for a meaningful minority of cases at any age
Because the underlying obstruction rarely resolves on its own, recurrence is common until the drainage pathway is definitively addressed.
Pathophysiology
The disease process follows a predictable sequence once outflow is blocked.
- Obstruction of the nasolacrimal duct prevents normal tear drainage into the nose
- Tears and debris accumulate and stagnate within the lacrimal sac
- Stagnant fluid becomes a favorable environment for bacterial overgrowth
- Bacterial infection triggers acute inflammation, producing the characteristic pain, erythema, and swelling
- Untreated infection can progress to abscess formation and, in severe cases, spread to adjacent preseptal or orbital tissue
Because the obstruction is the root cause, treating only the acute infection without eventually addressing the blockage sets the stage for recurrence.
Risk Factors
Anatomic and Local Risk Factors
- Age-related narrowing of the nasolacrimal duct
- Congenital nasolacrimal duct obstruction in infants
- Nasal septal deviation or other intranasal pathology narrowing the duct’s nasal opening
- Prior facial or nasal trauma affecting the lacrimal drainage pathway
Other Risk Factors
- Female sex, related to a comparatively narrower nasolacrimal duct
- Chronic sinus disease or rhinitis
- Lacrimal sac tumors or masses, which should be considered in atypical or treatment-resistant cases
- Prior radiation or chemotherapy affecting the lacrimal drainage system
Recurrent dacryocystitis, especially when unilateral and unresponsive to standard treatment, should always prompt consideration of an underlying mass lesion.
Clinical Presentation
Symptoms
- Sudden onset of pain, redness, and swelling at the inner corner of the eye
- Excessive tearing (epiphora) preceding or accompanying the acute episode
- Discharge that can be expressed from the punctum with gentle pressure over the sac
- Fever and systemic symptoms in more severe or spreading infections
Examination Findings
- Tender, erythematous swelling centered precisely over the lacrimal sac, below the medial canthal tendon
- Mucopurulent discharge expressible from the punctum on gentle compression of the sac
- Surrounding preseptal erythema and edema in more extensive infections
- Preserved visual acuity, pupil reactivity, and eye movements — findings that, if abnormal, suggest orbital rather than isolated lacrimal sac involvement
- A palpable, sometimes fluctuant mass in cases progressing to abscess
The location directly over the lacrimal sac, just below and medial to the canthal tendon, is what distinguishes dacryocystitis from other causes of medial eyelid swelling.
Diagnostic Evaluation
Clinical Examination
- Diagnosis is primarily clinical, based on the characteristic location, tenderness, and expressible discharge
- Gentle palpation over the sac to elicit reflux of discharge through the punctum supports the diagnosis
Assessing for Orbital Involvement
- Visual acuity, pupil reactivity, and extraocular movement testing in every case to exclude spread to the orbit
- Imaging (CT of the orbits and sinuses) when orbital cellulitis, abscess, or an underlying mass is suspected
Culture and Further Workup
- Culture of expressed discharge can guide antibiotic selection in severe or refractory cases
- Nasolacrimal duct probing or irrigation is deferred until acute inflammation has resolved
- Biopsy is warranted for atypical, treatment-resistant, or mass-like presentations to exclude a lacrimal sac tumor
Imaging and biopsy are reserved for atypical or complicated presentations — most acute cases are diagnosed and treated on clinical grounds alone.
Differential Diagnosis
Conditions that can be confused with dacryocystitis include:
- Preseptal cellulitis — more diffuse eyelid swelling not centered specifically over the lacrimal sac
- Ethmoid sinusitis with periorbital extension — swelling extends more superiorly and medially, often with sinus symptoms
- Dacryocystocele in infants — a bluish, cystic medial canthal swelling present from birth rather than an acute infection
- Lacrimal sac tumor — a firm, often painless or minimally tender mass, particularly relevant in recurrent or atypical cases
- Canaliculitis — swelling and discharge localized to the punctum and canaliculus rather than the sac itself
The precise anatomic location over the lacrimal sac, combined with expressible discharge, is usually sufficient to distinguish dacryocystitis from these mimics.
Management
Acute Infection
- Systemic antibiotics covering the most common organisms — Staphylococcus species, streptococci, and Haemophilus influenzae, particularly in children
- Warm compresses to the affected area to promote comfort and drainage
- Incision and drainage for a well-localized, fluctuant abscess that does not respond to antibiotics alone
Definitive Treatment of the Obstruction
- Dacryocystorhinostomy (DCR), performed once the acute infection has resolved, creates a new drainage pathway between the lacrimal sac and the nasal cavity
- DCR can be performed externally or endoscopically, depending on surgeon preference and anatomic factors
- Nasolacrimal duct probing is often first-line for congenital obstruction in infants, since many cases resolve with observation or simple probing in the first year of life
Special Considerations
- Probing or irrigation of the nasolacrimal system is avoided during active acute infection, since it risks pushing infection further along the drainage pathway
- Any suspicion of an underlying mass warrants biopsy before proceeding with standard drainage surgery
Treating the acute infection resolves the emergency, but definitive surgery is usually what actually prevents the next episode.
Prognosis
Prognosis is good with appropriate treatment of both the acute infection and, when indicated, the underlying obstruction.
- Acute infection typically resolves within days with appropriate antibiotics
- Without definitive surgical correction of the obstruction, recurrence is common
- Dacryocystorhinostomy has a high success rate in restoring normal tear drainage and preventing further infections
- Delayed or inadequate treatment carries a risk of progression to orbital cellulitis, a more serious and vision-threatening complication
Long-term success depends on treating the mechanical obstruction, not just the infection that it produced.
Would you like to document anterior segment findings with your smartphone?
Smartphone slit-lamp photography makes it easy to document medial canthal swelling and discharge in dacryocystitis and track the response to treatment over time using a simple slit-lamp adaptor.
SLIT-LAMP SMARTPHONE PHOTOGRAPHY
References
- Dacryocystitis. StatPearls, NCBI Bookshelf.
- Dacryocystitis. Merck Manual, Professional Edition.
- Pinar-Sueiro S, Sota M, Lerchundi TX, et al. Dacryocystitis: systematic approach to diagnosis and therapy. Current Infectious Disease Reports. 2012.
- Taylor RS, Ashurst JV. Dacryocystitis. Cleveland Clinic Journal of Medicine. 2020.
- Dacryocystitis. EyeWiki, American Academy of Ophthalmology.
