Ophthalmology · Lacrimal System Disorders
The facts most likely to be tested
Dacryoadenitis is an acute inflammation of the lacrimal gland typically presenting with unilateral pain, redness, and swelling in the superotemporal orbit.
Physical examination reveals an S-shaped ptosis caused by the mass effect of the inflamed lacrimal gland on the upper eyelid.
Acute dacryoadenitis is most commonly caused by viral infections, specifically Epstein-Barr virus (EBV), mumps, or herpes zoster.
Chronic dacryoadenitis is frequently associated with systemic inflammatory conditions such as sarcoidosis, Sjogren syndrome, or IgG4-related ophthalmic disease.
Diagnosis is primarily clinical, but CT imaging of the orbits is indicated if there is suspicion of an orbital abscess or to evaluate for underlying orbital masses.
Management of viral dacryoadenitis is supportive with warm compresses and oral analgesics, whereas bacterial cases require systemic antibiotics.
Dacryoadenitis must be distinguished from dacryocystitis, which involves inflammation of the lacrimal sac and presents with swelling at the medial canthus.
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A 24-year-old male presents to the urgent care clinic with a 3-day history of progressive pain and swelling in his right upper eyelid. He reports recent malaise and a low-grade fever. On physical exam, there is erythema and tenderness localized to the superotemporal aspect of the right orbit. The eyelid is drooping, creating an S-shaped contour of the lid margin. The eye itself is not proptotic, and extraocular movements are full and painless.
What is the most likely diagnosis?
Dacryoadenitis
The patient's presentation of superotemporal orbital swelling and the classic S-shaped ptosis are pathognomonic for inflammation of the lacrimal gland (dacryoadenitis).
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High yield triage
Etiology / Epidemiology
Inflammation of the lacrimal gland, often viral (mumps, EBV) or autoimmune (Sjogren's, sarcoidosis).
Clinical Manifestations
Unilateral S-shaped eyelid deformity with supratemporal tenderness and erythema.
Diagnosis
CT orbit is the gold standard to differentiate from orbital cellulitis.
Treatment
Viral: warm compresses and supportive care; Bacterial: cephalexin.
Prognosis
Usually self-limiting; orbital cellulitis is the primary red-flag complication.
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Epidemiology & Etiology
Acute cases are typically viral in children and young adults, frequently associated with mumps or Epstein-Barr virus. Chronic cases are more common in middle-aged patients and are strongly linked to systemic inflammatory diseases like sarcoidosis, Sjogren's syndrome, or Graves' ophthalmopathy.
Pertinent Anatomy
The lacrimal gland is located in the superotemporal orbit. The gland is divided by the levator palpebrae superioris muscle into a larger orbital lobe and a smaller palpebral lobe, the latter of which is visible upon eyelid eversion.
Pathophysiology
Inflammation leads to glandular swelling and obstruction of the lacrimal ducts. This results in localized pain, edema, and the characteristic S-shaped ptosis of the upper eyelid. Chronic inflammation may lead to permanent lacrimal hyposecretion and subsequent dry eye syndrome.
Clinical Manifestations
Patients present with acute, unilateral supratemporal pain, redness, and swelling. The hallmark is the S-shaped eyelid deformity caused by the enlarged lacrimal gland. Red flags include restricted extraocular motility, proptosis, or vision changes, which suggest progression to orbital cellulitis.
Diagnosis
Clinical diagnosis is often sufficient for mild cases. CT orbit with contrast is the gold standard imaging modality to confirm lacrimal gland enlargement and rule out abscess formation or orbital extension. Biopsy is reserved for chronic cases to rule out lymphoma or inflammatory pseudotumor.
Treatment
Viral dacryoadenitis is managed with warm compresses and analgesics. Bacterial cases require systemic antibiotics such as cephalexin or amoxicillin-clavulanate. Do not delay imaging if orbital cellulitis is suspected, as this requires IV antibiotics and potential surgical drainage.
Prognosis
Most acute cases resolve within 1-2 weeks with appropriate therapy. Chronic cases require management of the underlying systemic disease to prevent corneal ulceration or permanent visual impairment.
Differential Diagnosis
Orbital cellulitis: restricted extraocular movements and proptosis
Dacryocystitis: inflammation of the lacrimal sac (inferomedial)
Orbital pseudotumor: painful ophthalmoplegia and steroid-responsive
Lacrimal gland tumor: painless, progressive, and firm on palpation
Preseptal cellulitis: no involvement of orbital structures or motility