Rheumatology · Systemic Autoimmune Diseases
The facts most likely to be tested
Sjögren syndrome is a chronic autoimmune disorder characterized by lymphocytic infiltration of exocrine glands, primarily the lacrimal and salivary glands.
Patients classically present with keratoconjunctivitis sicca (dry eyes) and xerostomia (dry mouth), often described as a 'sandy/gritty' sensation in the eyes and difficulty swallowing dry foods.
The most specific serologic markers are anti-SSA (anti-Ro) and anti-SSB (anti-La) antibodies.
Diagnosis is supported by a positive Schirmer test (measuring tear production) or a labial salivary gland biopsy showing focal lymphocytic sialadenitis.
Patients have a significantly increased risk of developing B-cell non-Hodgkin lymphoma, specifically mucosa-associated lymphoid tissue (MALT) lymphoma.
Initial management for sicca symptoms includes artificial tears, saliva substitutes, and cholinergic agonists like pilocarpine or cevimeline.
Extraglandular manifestations include arthralgias, Raynaud phenomenon, cutaneous vasculitis, and interstitial lung disease.
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A 52-year-old woman presents with a 6-month history of persistent dry eyes and dry mouth. She reports needing to drink water to swallow dry crackers and feels a gritty sensation in her eyes throughout the day. Physical examination reveals bilateral parotid gland enlargement and dental caries. Laboratory studies demonstrate a positive anti-SSA (Ro) antibody titer.
What is the most likely diagnosis and the most concerning long-term malignancy associated with this condition?
Sjögren syndrome; B-cell non-Hodgkin lymphoma (MALT lymphoma)
The patient's classic sicca symptoms and positive anti-SSA antibodies confirm Sjögren syndrome, which carries a high risk for MALT lymphoma due to chronic B-cell stimulation.
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High yield triage
Etiology / Epidemiology
Autoimmune destruction of exocrine glands; middle-aged women (9:1 ratio).
Clinical Manifestations
Keratoconjunctivitis sicca and xerostomia; sicca complex.
Diagnosis
Anti-SSA (Ro) or Anti-SSB (La) antibodies; Schirmer test <5mm.
Treatment
Pilocarpine or Cevimeline; avoid anticholinergics.
Prognosis
40-fold increased risk of B-cell non-Hodgkin lymphoma.
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Epidemiology & Etiology
Primary Sjögren occurs in isolation, while secondary Sjögren is associated with other autoimmune diseases like rheumatoid arthritis. It predominantly affects postmenopausal women. Genetic predisposition is linked to HLA-DR3 and HLA-DRw52 alleles.
Pertinent Anatomy
The disease targets the lacrimal glands (causing dry eyes) and salivary glands (causing dry mouth). Lymphocytic infiltration of the parotid gland leads to characteristic bilateral swelling.
Pathophysiology
Chronic inflammation leads to lymphocytic infiltration of exocrine glands. T-cell mediated destruction causes glandular atrophy and loss of secretory function. Persistent immune activation leads to the production of rheumatoid factor and hypergammaglobulinemia.
Clinical Manifestations
Patients present with sicca complex: xerophthalmia (gritty/sandy eyes) and xerostomia (difficulty swallowing dry food). Physical exam reveals parotid enlargement and dental caries. Red flag: sudden onset of firm, unilateral parotid swelling suggests B-cell lymphoma.
Diagnosis
The Schirmer test is the gold standard for ocular dryness, with a result of <5 mm in 5 minutes being diagnostic. Serology shows Anti-SSA (Ro) or Anti-SSB (La). A labial salivary gland biopsy showing focal lymphocytic sialadenitis is the most specific diagnostic test.
Treatment
First-line therapy for xerostomia is Pilocarpine or Cevimeline (muscarinic agonists). Contraindicated in patients with asthma or narrow-angle glaucoma. Ocular symptoms are managed with artificial tears and cyclosporine drops.
Prognosis
Patients require lifelong monitoring for B-cell non-Hodgkin lymphoma, specifically MALT lymphoma. Annual screening for persistent parotid swelling or lymphadenopathy is mandatory.
Differential Diagnosis
Sarcoidosis: bilateral parotid enlargement without sicca symptoms
IgG4-related disease: elevated serum IgG4 levels
HIV infection: parotid cysts and lymphadenopathy
Hepatitis C: associated with mixed cryoglobulinemia
Medication side effects: anticholinergics/antihistamines causing dry mouth