A 28-year-old woman from Delhi with a history of untreated pulmonary TB 2 years ago now presents with recurrent cough and hemoptysis. Chest X-ray shows multiple thin-walled cavities in both upper lobes, some with air-fluid levels, and surrounding areas of consolidation with bronchial wall thickening. High-resolution CT confirms the cavities and shows bronchiectasis in the surrounding lung. What is the most likely diagnosis based on these imaging findings?

Explanation

## Chronic Cavitary Tuberculosis with Bronchiectasis ### Pathophysiology of Chronic TB **Key Point:** Chronic cavitary TB develops when active TB is inadequately treated or incompletely resolved, leading to persistent cavitation, bronchial damage, and secondary bronchiectasis. **High-Yield:** Chronic TB cavities differ from acute TB cavities: - **Multiple cavities** (not solitary) - **Thin-walled** (due to fibrosis and chronicity) - **Air-fluid levels** may be present (from superimposed infection or drainage) - **Bronchial wall thickening** and **bronchiectasis** in surrounding lung (from chronic inflammation and traction) - **Fibrotic changes** and **pleural thickening** in adjacent areas ### Radiological Features of Chronic Cavitary TB ```mermaid flowchart TD A[Inadequately Treated TB]:::outcome --> B[Persistent Cavitation]:::outcome B --> C[Chronic Inflammation]:::outcome C --> D[Bronchial Damage]:::outcome D --> E[Bronchiectasis + Bronchial Wall Thickening]:::outcome E --> F[Fibrosis + Pleural Thickening]:::outcome F --> G[Hemoptysis Risk]:::urgent G --> H[Recurrent Cough]:::outcome ``` ### Imaging Characteristics | Feature | Acute TB | Chronic TB | Aspergilloma | |---------|----------|-----------|---------------| | Cavity number | Often solitary | Multiple | Single or few | | Cavity wall | Thick, irregular | Thin, smooth | Thick-walled, fungal ball visible | | Air-fluid level | Rare | Common | Rare (fungal ball fills cavity) | | Bronchiectasis | Minimal | Prominent | May be present | | Fibrosis | Minimal | Extensive | Minimal unless chronic TB | | Associated findings | Satellite nodules | Bronchial thickening, pleural changes | Halo sign (acute), cavitary wall sign | **Clinical Pearl:** The presence of **bronchiectasis** in the same lobe as cavitation is a hallmark of chronic TB, as the chronic inflammatory process damages the bronchial walls and causes traction bronchiectasis. ### Why This Is Chronic TB, Not Aspergilloma **Aspergilloma** (fungal ball) would show: - A **mobile fungal ball** within a cavity (may change position on different views) - **Halo sign** on CT (ground-glass opacity around the ball, indicating acute angioinvasion) - **Cavitary wall sign** (crescent of air between fungal ball and cavity wall) - Often **solitary cavity** (usually in a pre-existing TB cavity) - **No bronchiectasis** in the surrounding lung (unless pre-existing from TB) In this case, the **multiple cavities, bronchiectasis, and bronchial wall thickening** indicate chronic TB with secondary changes, not superimposed aspergilloma. ### Hemoptysis in Chronic TB **High-Yield:** Hemoptysis in chronic TB is caused by: 1. **Erosion of bronchial arteries** (which are hypertrophied due to chronic inflammation) 2. **Bronchiectasis** with friable mucosa 3. **Cavitary disease** with granulation tissue This is why chronic TB with bronchiectasis carries a high risk of life-threatening hemoptysis. [cite:Harrison 21e Ch 165]