## Management of Tuberculous Lymphadenitis in Children ### Clinical Diagnosis Confirmation This child has **tuberculous lymphadenitis (scrofula)**, confirmed by: - TB contact history - Positive TST (≥5 mm in contact case) - FNAC showing caseating granulomas (diagnostic) - Normal CXR (primary extrapulmonary TB) **Key Point:** FNAC with caseating granulomas is sufficient for diagnosis of TB lymphadenitis in a child with TB contact and positive TST. No further diagnostic delay is justified. ### Why Anti-TB Therapy Is Initiated Immediately | Consideration | Rationale | |---|---| | **Diagnostic certainty** | Caseating granulomas + contact + TST = TB confirmed | | **Risk of delay** | Lymph node enlargement may cause airway compression or fistulization | | **Standard practice** | WHO and Indian guidelines recommend starting therapy on clinical + FNAC evidence | | **Prognosis** | Early therapy prevents complications and ensures cure | **High-Yield:** In pediatric TB lymphadenitis, **caseating granulomas on FNAC + TB contact + positive TST = diagnostic confirmation**. Do NOT wait for culture or further imaging. ### Rationale Against Other Options **Excision of lymph node (Option A):** - Surgical excision is reserved for: - Diagnosis when FNAC is inconclusive or negative - Residual lymph nodes after 6–9 months of completed therapy (if causing cosmetic concern or airway compression) - **NOT** as first-line management when diagnosis is already confirmed - Premature excision risks: - Sinus tract formation - Delayed healing - Unnecessary morbidity **Clinical Pearl:** Surgical excision of TB lymph nodes during active disease is contraindicated because it may cause dissemination and fistula formation. Surgery is only considered after completion of anti-TB therapy if residual nodes persist. **Repeat FNAC (Option C):** - FNAC is a diagnostic tool, not a monitoring tool - Response to therapy is assessed clinically (lymph node size reduction) and radiologically (ultrasound), not by repeat FNAC - Unnecessary delay in starting therapy **CT chest/abdomen (Option D):** - Normal CXR and absence of systemic symptoms make disseminated TB unlikely - TB lymphadenitis is a localized form of primary TB - CT is not indicated for routine evaluation; it may be used if there is clinical suspicion of mediastinal involvement or airway compression ### Recommended Anti-TB Regimen for Children **Standard 4-drug therapy (HRZE):** - **H** (Isoniazid): 10 mg/kg/day - **R** (Rifampicin): 15 mg/kg/day - **Z** (Pyrazinamide): 25 mg/kg/day - **E** (Ethambutol): 25 mg/kg/day **Duration:** 2 months intensive phase (HRZE) + 4 months continuation phase (HR) = **6 months total** **Key Point:** All forms of TB in children (pulmonary and extrapulmonary) are treated with the same 6-month regimen because children rarely develop drug-resistant TB and have excellent treatment outcomes. ### Expected Clinical Course 1. **Weeks 2–4:** Fever resolves, appetite improves 2. **Weeks 4–8:** Lymph node begins to shrink 3. **Months 3–6:** Progressive lymph node regression 4. **After 6 months:** Most nodes resolve completely; residual firm nodes may persist (these are fibrosed, non-infectious) **Clinical Pearl:** Paradoxical enlargement of lymph nodes may occur in the first 2–4 weeks of therapy (immune reconstitution inflammatory response, IRIR)—this is NOT treatment failure and does NOT warrant stopping therapy. [cite:Park 26e Ch 9; WHO TB Guidelines 2023]
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