What is the recommended management of scrofula (tuberculous cervical lymphadenitis) in children?

Management of Scrofula (Tuberculous Cervical Lymphadenitis) in Children

Treat scrofula in children with a 6-month regimen of rifampicin, isoniazid, pyrazinamide, and ethambutol for 2 months, followed by rifampicin and isoniazid for 4 months. 1

Pharmacological Treatment Regimen

Initial Phase (2 months)

• Rifampicin: 10 mg/kg daily (max 600 mg if >50 kg, 450 mg if <50 kg) 1
• Isoniazid: 5 mg/kg daily (max 300 mg) 1
• Pyrazinamide: 35 mg/kg daily (max 2.0 g if >50 kg, 1.5 g if <50 kg) 1
• Ethambutol: 15 mg/kg daily 1

Continuation Phase (4 months)

• Rifampicin: 10 mg/kg daily 1
• Isoniazid: 5 mg/kg daily 1

When to Omit Ethambutol

The fourth drug (ethambutol) can be omitted in children with low risk of drug resistance—specifically, those who are previously untreated, HIV-negative, and not contacts of known drug-resistant cases. 1 However, ethambutol at 15 mg/kg can be safely used in children aged 5 years or older without undue fear of ocular toxicity. 1

Diagnostic Confirmation

Obtain bacteriological confirmation whenever possible through fine needle aspiration cytology (FNAC) or excisional biopsy with AFB smear, culture, and drug susceptibility testing. 1, 2, 3

• FNAC has a diagnostic yield of approximately 90% and is the preferred initial diagnostic tool 2, 3
• Excisional biopsy should be reserved for cases where FNAC is non-diagnostic or when therapeutic excision is needed 4
• Always culture lymph node specimens to identify drug resistance patterns 4—failure to do so has resulted in missed multidrug-resistant cases 4

Role of Surgery

Surgery is NOT routinely indicated for scrofula. 1, 3 Medical therapy alone achieves cure in the vast majority of cases. 2, 3

Limited Surgical Indications

• Excisional biopsy: Only for diagnostic purposes when FNAC is inconclusive 4, 3
• Ultrasound-guided needle aspiration: For large fluctuant nodes that appear about to drain spontaneously 1, 5
• Therapeutic excision: Reserved for ongoing suppuration despite 6 months of appropriate anti-tuberculous therapy 4, 3

Avoid incision and drainage—this technique is associated with prolonged wound discharge, fistula formation, and scarring. 1

Management of Paradoxical Reactions

Lymph nodes may enlarge, new nodes may appear, or suppuration may develop during or after appropriate therapy without indicating treatment failure. 1, 5 This paradoxical reaction occurs even in immunocompetent children. 5

• Continue anti-tuberculous therapy as planned 1
• Consider adjunctive corticosteroids for massive cervical adenopathy with paradoxical enlargement 5
• Perform ultrasound-guided therapeutic aspiration for large fluctuant nodes 5
• Do NOT interpret paradoxical reactions as treatment failure requiring surgical intervention 1

Supervision and Monitoring

Children should be managed by a paediatrician with tuberculosis expertise or by a general paediatrician in conjunction with a physician trained in tuberculosis management. 1

• Directly observed therapy (DOT) should be the standard of care 1
• Monitor clinical response through lymph node size, constitutional symptoms, and weight gain 1
• Expect clinical improvement by 2 months if therapy is effective 1

Special Considerations

HIV-Infected Children

• Extend treatment duration to 9 months for pulmonary TB and 12 months for extrapulmonary TB in HIV-infected children 1
• Use daily or thrice-weekly dosing in severely immunosuppressed children (CD4 <15% or <100 cells/μL if ≥6 years old)—avoid twice-weekly regimens due to risk of rifamycin resistance 1

Drug-Resistant TB

• If isoniazid resistance is confirmed, discontinue isoniazid and continue rifampicin, pyrazinamide, and ethambutol 1
• For multidrug-resistant TB, consult a specialist and base therapy on resistance patterns 1
• Always obtain mycobacterial culture before excisional biopsy to avoid missing drug resistance 4

Pyridoxine Supplementation

Supplemental pyridoxine is not routinely necessary except for breast-fed infants and malnourished children. 1

Common Pitfalls to Avoid

• Do not perform routine surgical excision—medical therapy alone is curative in >94% of cases 6, 3
• Do not use incision and drainage—this leads to fistulization and scarring 1
• Do not interpret paradoxical lymph node enlargement as treatment failure—this is expected and does not require regimen change 1, 5
• Do not fail to culture lymph node specimens—this has resulted in missed multidrug-resistant cases 4
• Do not extend treatment beyond 6 months for drug-susceptible disease in immunocompetent children—this provides no additional benefit 1, 3