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Now I have comprehensive information to compile a complete MD-exam-focused answer on Wallgren's timetable for TB.
Wallgren's Timetable of Tuberculosis — Complete MD Exam Notes
Original reference: Wallgren A. "The time-table of tuberculosis." Tubercle, 1948; 29:245–251.
Wallgren's timetable maps the temporal evolution of primary TB infection and its complications following initial exposure. It is essential for pediatric TB and is repeatedly tested in MD/PG exams.
⏱️ The Complete Timetable
🔵 Phase 1: 0–6 Weeks — Primary Infection Phase
| Event | Details |
|---|---|
| Bacillary implantation in lung | → Ghon focus (subpleural granuloma, lower/mid lobe) |
| Lymphatic spread | → Hilar lymphadenopathy → Ghon complex (focus + node) |
| Clinical features | Usually asymptomatic or mild fever, malaise |
| Tuberculin skin test (TST) | Converts positive at 3–6 weeks post-infection |
| CXR | Subpleural nodule + hilar/mediastinal lymphadenopathy |
Key exam point: TST conversion is the hallmark of this phase. The patient is TST-negative early, then converts.
🔴 Phase 2: 6 Weeks – 3 Months — Dissemination Phase (PEAK RISK)
| Event | Details |
|---|---|
| Hematogenous dissemination | Peak risk of bacteraemic spread |
| Miliary TB | Uniform 1–3 mm random nodules on CXR/HRCT |
| TB Meningitis | Most dangerous; subacute onset 3–6 weeks of symptoms; affects children <4 years primarily |
| Erythema nodosum | Hypersensitivity reaction (immune response to mycobacterial antigen) |
| Phlyctenular conjunctivitis | Hypersensitivity eye manifestation |
| Progressive primary TB | Consolidation with central necrosis |
Key exam point: Miliary TB and TB meningitis occur 2–6 months after primary infection; peak dissemination risk window is 6 weeks–3 months. TB meningitis is the most feared complication in young children.
🟠 Phase 3: 3–6 Months — Progressive Primary Phase
| Event | Details |
|---|---|
| Progressive primary pulmonary TB | Lobar/segmental consolidation |
| Pleural effusion (primary) | Serous exudative pleural effusion |
| Lymph node compression | Endobronchial disease, collapse-consolidation |
| Superficial lymphadenopathy | Cervical, axillary TB adenitis begins |
Key exam point: Pleural effusion in primary TB = hypersensitivity reaction, usually unilateral.
🟡 Phase 4: 3–9 Months — TB Adenitis Phase
| Event | Details |
|---|---|
| TB lymphadenitis (adenitis) | Most common form of extrapulmonary TB in children |
| Cervical nodes most common | "Cold abscess" → scrofuloderma if skin involved |
| Mediastinal adenopathy | Can cause obstructive features |
Classic exam statement: TB adenitis classically develops 3–9 months after primary infection.
🟢 Phase 5: 6 Months – 2 Years — Late Extrapulmonary Phase
| Event | Details |
|---|---|
| Abdominal TB | Peritoneal, mesenteric adenitis, ileocaecal |
| Spinal TB (Pott's disease) | Thoracolumbar junction most common |
| Early skeletal TB | Especially dactylitis (Spina ventosa) in children |
⚪ Phase 6: Several Years — Skeletal TB
| Event | Details |
|---|---|
| Bones and joints TB | Several years (5–7 years) after primary infection |
| Pott's spine | Thoracolumbar junction; vertebral collapse, gibbus deformity |
| Hip, knee involvement | Weight-bearing joints |
| Dactylitis | Short tubular bones of hands/feet in children |
Key exam point: Skeletal TB = several years after primary infection.
🔵 Phase 7: > Decade — Genitourinary TB
| Event | Details |
|---|---|
| Renal TB | >10 years after primary infection; "sterile pyuria" |
| Genital TB | Female > Male; commonest cause of infertility in endemic areas |
| Clinical clue | Pyuria with sterile urine culture = suspect renal TB |
Key exam point: Renal and genital TB may take over a decade to manifest.
🔲 Phase 8: > 2 Years — Reactivation/Post-Primary TB
| Event | Details |
|---|---|
| Reactivation of dormant foci | Reactivation TB (secondary/post-primary) |
| Cavitary pulmonary TB | Apical/upper lobe predominance; high bacillary burden |
| Target group | Immunosuppression, malnutrition, steroid use, HIV |
| CXR | Thick-walled cavities, tree-in-bud pattern, fibrosis |
📋 Summary Table — Wallgren's Timetable (High-Yield)
| Time After Primary Infection | Event/Complication |
|---|---|
| 0–6 weeks | Ghon focus, Ghon complex; TST converts |
| 6 weeks – 3 months | PEAK DISSEMINATION → Miliary TB, TB Meningitis, Erythema nodosum, Phlyctenular conjunctivitis |
| 3–6 months | Progressive primary pneumonia, Pleural effusion |
| 3–9 months | TB Adenitis (cervical lymphadenopathy) |
| 6 months – 2 years | Abdominal TB, early Pott's spine |
| Several years (5–7 yr) | Bones & Joints TB (Pott's spine, hip, dactylitis) |
| >10 years | Renal TB, Genital TB |
| >2 years | Reactivation/Post-primary TB (cavitary) |
🎯 High-Yield Exam Points
- Miliary TB + TB meningitis = 2–6 months (peak risk 6 weeks–3 months); most dangerous in children < 4 years
- TB adenitis = 3–9 months; most common extrapulmonary TB in children
- Skeletal TB = several years (5–7); Pott's spine at thoracolumbar junction
- Renal/Genital TB = > 1 decade; "sterile pyuria" is classic clue for renal TB
- Reactivation TB = > 2 years; apical cavitary disease
- TST conversion = 3–6 weeks after exposure
- Erythema nodosum & phlyctenular conjunctivitis = early hypersensitivity manifestations (6 weeks–3 months)
- Ranke complex = healed/calcified Ghon complex (seen years later on CXR)
🧠 Memory Aid — "MGP → A → BS → RGR"
- Miliary/Meningitis → Ghon complex → Pleural effusion (early, 0–6 months)
- Adenitis (3–9 months)
- Bones (several years) → Spine (Pott's)
- Renal/Genital (decade+) → Reactivation (> 2 years)
Reference: Wallgren A. The time-table of tuberculosis. Tubercle. 1948;29:245–251. Revisiting the timetable of tuberculosis — PMC6105930.
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