Dakriosistitis

01Pathophysiology

The lacrimal drainage system begins at the puncta on the upper and lower eyelids, continues through the canaliculi, converges at the lacrimal sac (located in the lacrimal fossa of the medial orbital wall), and drains into the nasolacrimal duct, which empties into the inferior nasal meatus beneath the inferior turbinate.

Dacryocystitis develops when the nasolacrimal duct becomes obstructed, causing stagnation of tears within the lacrimal sac. This stagnant fluid becomes a culture medium for bacterial colonization, leading to infection and inflammation of the sac itself. The obstruction can be congenital (failure of canalization of the valve of Hasner at the distal end of the nasolacrimal duct) or acquired (chronic inflammation, dacryolith, trauma, or involutional stenosis).

In acute dacryocystitis, rapid bacterial proliferation causes distension of the lacrimal sac with purulent material. The infection may extend beyond the sac wall into surrounding soft tissues, producing preseptal cellulitis or, rarely, a lacrimal sac abscess that can fistulize to the skin surface. The reason the swelling localizes inferior to the medial canthal tendon is that the lacrimal sac sits in the lacrimal fossa just below and behind the tendon. This anatomical landmark is tested frequently: swelling above the tendon suggests a different etiology (e.g., dermoid cyst, encephalocele).

In chronic dacryocystitis, low-grade infection causes persistent tearing and intermittent mucopurulent discharge without significant pain or erythema. The sac may become distended (mucocele) and palpable as a non-tender mass at the medial canthus.

In congenital dacryocystitis, an imperforate membrane at the valve of Hasner causes tear stasis from birth, presenting as persistent tearing and crusting in the first weeks of life. If the stagnant fluid becomes infected, the condition progresses to acute dacryocystitis of infancy, which can be distinguished from simple nasolacrimal duct obstruction by the presence of erythema and tenderness over the sac.

02Classification and Clinical Manifestation

Complication

03Diagnostic Workup

Acute dacryocystitis is primarily a clinical diagnosis. The classic presentation of a tender, erythematous swelling localized below the medial canthal tendon, combined with purulent reflux from the punctum on compression of the sac, is highly characteristic and often sufficient for diagnosis without further investigation.

The dye disappearance test is a simple, non-invasive screening tool. A drop of fluorescein is instilled into both eyes, and after 5 minutes, the clinician checks whether dye has cleared. Asymmetric retention strongly suggests obstruction on the affected side. This test is particularly useful in pediatric patients who are uncooperative for irrigation.

Lacrimal irrigation is the confirmatory bedside test for nasolacrimal duct patency. Saline is injected through the lower punctum. In a patent system, the patient reports tasting or swallowing fluid. In complete obstruction, fluid refluxes through the upper punctum, and nothing reaches the nose.

Dacryocystography is the most accurate test for defining the exact anatomical location of obstruction and is typically ordered when surgical planning (DCR) is being considered. It can differentiate between canalicular, sac-level, and duct-level obstruction.

CT imaging is reserved for complicated cases where orbital cellulitis, abscess formation, or an underlying mass is suspected. It is not part of the routine workup for uncomplicated dacryocystitis.

04Management and Treatment

Acute management begins with warm compresses to the affected area and systemic antibiotics. The antibiotic choice should cover gram-positive organisms, particularly S. aureus and Streptococcus species. Amoxicillin-clavulanate is the first-line oral agent. If the patient has a penicillin allergy, clindamycin or a fluoroquinolone may be substituted, though fluoroquinolones should be avoided in children.

A fluctuant abscess requires incision and drainage before antibiotics alone can resolve the infection. Culture of the drained material guides targeted antibiotic therapy.

The key concept tested is the timing of definitive surgery. DCR should not be performed during the acute phase because of the risk of spreading infection and distorted tissue planes. Once the acute infection has fully resolved (typically 4 to 6 weeks later), elective DCR is performed. External DCR involves a skin incision and creating a bony ostium between the lacrimal fossa and the nasal cavity. Endoscopic (endonasal) DCR achieves the same goal without a skin incision and is increasingly preferred.

For congenital dacryocystitis, the initial management is conservative. The Crigler maneuver applies hydrostatic pressure to the nasolacrimal duct, which can rupture the membranous obstruction at the valve of Hasner. Parents should be instructed to perform this 2 to 3 times daily. The majority of cases (approximately 90%) resolve spontaneously by age 12 months. If epiphora and recurrent infection persist beyond this age, nasolacrimal duct probing under brief general anesthesia is indicated.

05Differential Diagnosis and Distractors

06Traps and High-Yield Pearls

The most common way students lose points on dacryocystitis questions is by confusing the anatomical location of the lacrimal sac with the lacrimal gland. Dacryocystitis produces swelling at the inferomedial canthus (where the lacrimal sac sits), while dacryoadenitis produces swelling at the superolateral orbit (where the lacrimal gland sits). If a vignette describes swelling "below and medial to the medial canthal tendon," think dacryocystitis. If it describes swelling of the "outer upper eyelid," think dacryoadenitis.

A second common trap involves the management of congenital nasolacrimal duct obstruction. Students frequently jump to probing as the initial step. The correct first-line approach is conservative: lacrimal sac massage (Crigler maneuver) and observation, because the vast majority of cases resolve by 12 months. Probing is reserved for cases that persist beyond this window.

Third, test-writers love to present an acute dacryocystitis case and ask about the "next best step" after the acute infection has resolved. The answer is elective dacryocystorhinostomy, not continued antibiotics. Without addressing the underlying anatomical obstruction, recurrence is essentially inevitable.

Finally, be aware that any patient with dacryocystitis who develops proptosis, ophthalmoplegia, or visual changes has likely progressed to orbital cellulitis, which changes the management entirely to urgent CT imaging and IV antibiotics. This escalation is a tested decision point.

The core competency being tested is the ability to localize periorbital pathology based on anatomical landmarks, sequence the workup from clinical diagnosis to confirmatory imaging when needed, and correctly time conservative versus surgical intervention.