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acute dacryocystitis lacrimal sac infection

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Acute Dacryocystitis

Anatomy & Pathophysiology

The lacrimal drainage system runs from the puncta → canaliculi → lacrimal sac → nasolacrimal duct → inferior meatus of the nose. Acute dacryocystitis is infection of the lacrimal sac, almost always secondary to nasolacrimal duct obstruction (NLDO). When outflow is blocked, stagnant tears create a reservoir for bacterial proliferation.

Less common causes of obstruction include:

Lacrimal sac diverticula or dacryoliths
Nasal/sinus surgery or trauma
Rarely, lacrimal sac tumors

Epidemiology

Bimodal distribution: neonates/infants (congenital NLDO, often from an imperforate valve of Hasner) and middle-aged to older adults (acquired NLDO, more common in women)
In children, dacryocystitis frequently follows a viral upper respiratory infection

Microbiology

Organism	Notes
Staphylococcus aureus	Most common overall
Streptococcus pneumoniae	Common in adults and children
Haemophilus influenzae	More common in children (chocolate agar for culture)
Gram-negative / atypical organisms	More common in diabetics, immunocompromised, and nursing home patients
MRSA	Consider in healthcare exposure, prior MRSA history

Clinical Presentation

Symptoms:

Subacute onset of pain and tenderness at the medial canthus
Epiphora (tearing)
Discharge (mucopurulent)
Fever or chills in more severe cases

Signs:

Erythematous, tender, tense swelling below the medial canthal tendon (critical anatomical landmark)
Mucoid or purulent discharge expressible from the punctum on pressure over the lacrimal sac
May progress to frank abscess formation
Associated preseptal cellulitis may develop
Rare: orbital cellulitis, skin fistula

Key pearl: Swelling is below the medial canthal tendon. If above — suspect lacrimal sac tumor or frontal sinus mucocele.

Acute (A) vs. Chronic (B) dacryocystitis — note the erythematous, fluctuant medial canthal swelling with purulent discharge in acute disease

Clinical photos (A) acute dacryocystitis with abscess and purulent discharge; (B) chronic dacryocystitis with localized swelling and crusting

Clinical photo and CT scan of acute dacryocystitis — axial contrast CT shows a rim-enhancing abscess in the left lacrimal sac region with surrounding preseptal soft tissue inflammation

Clinical appearance (A) and contrast-enhanced axial CT (B) showing rim-enhancing lacrimal sac abscess with periorbital inflammation

Differential Diagnosis

Condition	Distinguishing Feature
Facial/preseptal cellulitis	No discharge from punctum on pressure; patent lacrimal irrigation
Acute ethmoid sinusitis	Pain/erythema over nasal bone just medial to inner canthus; imaging diagnostic
Frontal sinus mucocele	Swelling above medial canthal tendon; proptosis and globe displacement
Lacrimal sac tumor	Mass above medial canthal tendon; no acute inflammatory signs
Dacryocystocele (infants)	Bluish, non-inflamed swelling; present from birth

Workup

History — prior episodes, sinus disease, trauma, surgery, immune status
Physical exam — apply gentle pressure with a cotton-tipped swab over the lacrimal sac to express discharge from the punctum; examine contralateral eye too
Gram stain and culture of expressed discharge — blood agar ± chocolate agar (children)
Evaluate for orbital signs — pupils, extraocular motility, proptosis, vision
CT orbits and paranasal sinuses — for severe/atypical cases, no response to antibiotics, or suspected orbital extension

Do NOT probe or irrigate the lacrimal system during the acute phase — this risks spreading the infection.

Treatment

Outpatient (Afebrile, systemically well, mild–moderate)

Patient	First-line	MRSA-suspected
Adults	Cephalexin 500 mg PO q6h or amoxicillin/clavulanate 875/125 mg PO BID	TMP-SMX 160/800 mg PO q12h or clindamycin 300 mg PO TID
Children	Amoxicillin/clavulanate 25–45 mg/kg/d PO in 2 divided doses (max 90 mg/kg/d)	—

Warm compresses and gentle massage to the inner canthal region 5–10 min QID
Topical antibiotics (e.g., trimethoprim/polymyxin B QID) as adjunct — topical alone is inadequate
Analgesia (acetaminophen ± codeine) PRN
Follow up daily until improvement confirmed

Inpatient (Febrile, acutely ill, or unreliable follow-up)

Adults: Cefazolin 1 g IV q8h
Children: Cefuroxime 50–100 mg/kg/d IV in 3 divided doses (ID consult)
Alternative (penicillin allergy): Clindamycin 10 mg/kg IV q6h
Vancomycin if MRSA suspected
Adjust based on culture/sensitivity; step down to oral after clinical improvement
Total course: 10–14 days

Abscess Management

Incision and drainage if pus is pointing / about to drain spontaneously
Risk: persistent sac-skin fistula (Fig. 3.20C in Kanski)

Definitive Surgical Treatment

Dacryocystorhinostomy (DCR) is commonly required after the acute infection has resolved to:

Prevent recurrence
Address the underlying NLDO
Facilitate closure of a fistula if present

A 2024 systematic review and meta-analysis (Li et al., PMID 38444220) examined early endonasal DCR during the acute phase, suggesting it may be safe and effective in selected patients — challenging the traditional approach of waiting for infection to fully resolve before surgery.

Complications

Complication	Comment
Lacrimal sac abscess	Common progression if untreated
Preseptal cellulitis	Spread of infection anterior to orbital septum
Orbital cellulitis	Rare but serious; requires IV antibiotics and urgent imaging
Skin fistula	Especially after spontaneous or surgical drainage
Recurrence	High without correction of underlying NLDO

Follow-Up

Daily visits until improvement confirmed
If outpatient condition worsens → hospitalize for IV antibiotics
Once infection resolves: probing and irrigation to assess nasolacrimal patency, then plan for DCR if obstructed

Sources:

Kanski's Clinical Ophthalmology: A Systematic Approach, 10th ed., pp. 124–125
The Wills Eye Manual, pp. 399–402
Tintinalli's Emergency Medicine, Chapter 122
Li J et al. "Early Endonasal Dacryocystorhinostomy for Acute Dacryocystitis." Am J Rhinol Allergy 2024 — PMID 38444220

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