- Abscess
- Tuberculosis
- Urinary infection
- Biliary infection
- Endocarditis
- Epstein-Barr virus
Immune (20%)
- Drugs
- Connective tissue diseases
- Sarcoidosis
Malignancy (30%)
- Lymphomas
- Leukaemia
- Solid tumours
Other
- Thyrotoxicosis
- Ulcerative colitis
- Crohn's disease
- Factitious
- 5-10% remain undiagnosed
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