Acute unilateral pyogenic cervical lymphadenitis in children

Acute unilateral pyogenic cervical lymphadenitis is an acute inflammation of a unilateral group of cervical lymph nodes caused by a bacterial infection in the draining area (e.g., URTI, impetigo, periodontal disease). Staphylococcus aureus and Streptococcus pyogenes are the most common causative organisms. Children aged 1–4 years are most likely to be affected. Diagnosis is primarily clinical. Treatment involves empiric antibiotic therapy; additional diagnostics (e.g., lymph node ultrasound, FNAC) should be considered if there is inadequate response within 72 hours of antibiotic therapy.

• Typically caused by an infection in the draining area (e.g., impetigo, URTI, periodontal disease) ^[1]
• Most common causative organisms: Streptococcus pyogenes and Staphylococcus aureus ^[1]

• Children aged 1–4 years are most commonly affected ^[1][2]
• Constitutional symptoms
• Node characteristics ^[1]
  • Unilateral
  • Submandibular and upper cervical lymph nodes (most common) ^[3][4]
  • Tender, mobile
  • Overlying erythema
  • May be fluctuant
  • Typically large (> 2 cm) ^[4][5]
• Features of the primary infection may be present, e.g.: ^[4]
  • URTI symptoms
  • Impetigo
  • Earache
  • Dental or periodontal disease

• Typically a clinical diagnosis ^[6]
• Diagnostic uncertainty: See "Diagnostics for cervical lymphadenopathy in children."
• FNA culture ^[1]
  • Indicated if there is no improvement within 72 hours of initiating antibiotic therapy
  • Usually Streptococcus pyogenes or Staphylococcus aureus
• Lymph node ultrasound ^[7]
  • Indicated in case of diagnostic uncertainty
  • Findings include:
    • Peripheral inflammation
    • Increased vascularity
    • Anechoic regions
    • Abscess may be present

General principles ^[2][3][5]

• Start empiric antibiotic therapy for acute unilateral pyogenic cervical lymphadenitis.
• Consider symptomatic and supportive care (e.g., antipyretics, nonopioid oral analgesia in children) as needed.
• Consider additional diagnostics (e.g., lymph node ultrasound, FNAC) if there is inadequate response to antibiotic therapy within 72 hours.

Symptoms typically improve within 72 hours of initiating antibiotics. Complete resolution of lymph node enlargement may take several weeks. ^[4]

Avoid corticosteroids in patients with suspected acute lymphadenitis until a definitive diagnosis is made; corticosteroids can alter the histopathological appearance of lymphoma or malignancy. ^[5]

Empiric antibiotic therapy for acute unilateral pyogenic cervical lymphadenitis

Mild infection

• Oral empiric antibiotic coverage for Staphylococcus aureus and Streptococcus pyogenes ^[2][3][5]
• Options include:
  • Clindamycin (off-label) ^[3][8][9]
  • Cephalexin (off-label in infants) ^[3][8][9]
  • Amoxicillin/clavulanate ^[3][8][9]
• Duration of therapy: 7–14 days ^[4]

Severe infection ^[2]

• Start empiric IV antibiotics in consultation with specialists; options include:
  • Nafcillin (for nonpurulent infections only; off-label) ^[9][10]
  • Cefazolin ^[9][10]
  • Clindamycin ^[9][10]
• Consider percutaneous aspiration ; refer to surgery for abscess drainage. ^[1][2][6]

Suspected periodontal disease

• Administer empiric antibiotics that cover anaerobic infection, e.g.:
  • Amoxicillin/clavulanate ^[1][2][9]
  • Clindamycin (off label) ^[1][2][9]
• Refer to a pediatric dentist.

Suspected MRSA infection

• Uncomplicated infection: oral trimethoprim sulfamethoxazole ^[5][9][10]
• Complicated infection: IV vancomycin (consult specialists) ^[9][10]