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Enlargement of the cervical lymph nodes commonly occurs with viral infections. These "reactive" nodes are usually small, firm and non-tender and they may persist for weeks to months.
Acute bacterial adenitis is characterised by larger nodes >10mm, which are tender and may be fluctuant. Most typically these are in the anterior part of the neck. There is often associated fever and warm, erythematous overlying skin. The majority are caused by Staphylococcus Aureus or
Group A Streptococcus (Strep pyogenes). A site of entry may be found e.g. mouth or scalp. Anaerobic bacteria may be associated with dental disease in older children.
Kawasaki Disease - unilateral, >15mm, painful nodes and other associated features.
Persistent enlargement of lymph nodes (> 2 weeks) may be caused by a number of other conditions:
Significant persistent enalargement may be associated with atopic eczema. These nodes are often more prominent in the posterior part of the neck and are usually bilateral.
Infectious mononucleosis (EBV), cytomegalovirus - may have generalised lymphadenopathy and hepatosplenomegaly.
Mycobacterium avium complex - Adenoapthy is usually unilateral and most cases occur in the under 5-year age group. Non-tender, slightly fluctuant node, which may become tethered to underlying structures. Violaceous hue to the overlying skin is sometimes seen.
Systemically well. Usually not immunocompromised.
Mycobacterium tuberculosis - non-tender nodes. History of exposure. Systemic symptoms of fever, malaise, weight loss.
Cat Scratch Disease (Bartonella henselae) - tender, usually axillary, nodes. History of a cat scratch or lick 2 weeks prior. There may be a papule at the site.
Toxoplasma gondii - generalised lymphadenopathy. Systemic features of fatigue or myalgia.
Lymphoma - Hodgkins, Non-Hodgkins
Leukaemia - ALL, AML, CML,
Juvenile chronic arthritis
Well - oral antibiotics for 10 days, with review in 48
Neonates, unwell or failed oral Rx - IV
Hypersensitive to penicillin: Cephazolin 25 mg/kg up to 2g IV 6 hourly
Severe penicillin hypersensitivity: Clindamycin 10mg/kg up to 450mg 6hourly
Persisting adenitis (>2 weeks) - consider the