CXR Findings

• Mild bilateral bronchovascular prominence, most pronounced in the lower zones
• No focal consolidation, cavitation, or discrete nodules
• Hilar regions appear normal - no lymphadenopathy
• No pleural effusion (costophrenic angles clear)
• Mediastinum central, cardiac silhouette normal (CTR < 50%)
• Bony thorax intact

Differential Diagnosis

Leading Hypotheses

• The most likely diagnosis in any patient with chronic productive cough + exertional dyspnea
• CXR in early-moderate COPD may show only increased bronchovascular markings; hyperinflation and barrel chest appear later
• Risk factors: smoking history, occupational dust/fume exposure, biomass fuel exposure (especially relevant in Indian settings)
• Spirometry (post-bronchodilator FEV1/FVC < 0.70) is diagnostic
• Symptom to Diagnosis, p. 613: "Presenting symptoms of COPD include progressive dyspnea, decreased exercise tolerance, cough, and sputum production"

• High-priority differential in the Indian subcontinent setting (Dr. B.R. Ambedkar Hospital, Bengaluru)
• 3 months of productive cough is the classic duration used as a screening threshold for TB
• CXR here lacks typical TB features (upper-lobe infiltrates, cavitation, lymphadenopathy) - but early or lower-lobe TB can be subtle
• Look for: night sweats, weight loss, evening fever, hemoptysis, contact history
• Investigate with: sputum AFB smear x3, GeneXpert MTB/RIF, CBNAAT

• Causes chronic productive cough (often copious, purulent), recurrent lower respiratory infections, and exertional breathlessness
• Bilateral bronchovascular prominence on CXR is a recognized early finding; "tram-track" lines or ring shadows appear as disease progresses
• Common causes in India: post-TB, non-tuberculous mycobacteria (NTM), post-infectious (measles, whooping cough), immunodeficiency
• CT chest is the gold-standard investigation
• Symptom to Diagnosis: "Bronchiectasis could cause symptoms of dyspnea, cough, and sputum production" - note sputum is usually heavy and purulent

Active Alternatives - Must Not Miss

• Can mimic COPD/respiratory disease, especially when exertional dyspnea is prominent
• CXR here shows normal cardiac size and no pulmonary edema/effusion - makes this less likely but does not exclude
• Rule out with: echocardiography, BNP/NT-proBNP
• Symptom to Diagnosis: "Heart failure frequently complicates COPD or is misdiagnosed as the pulmonary disease"

• Can present with productive cough, wheeze, and exertional breathlessness
• Typically episodic; CXR usually normal or shows mild hyperinflation
• Supports: allergy history, nocturnal symptoms, reversibility on bronchodilators
• Spirometry with bronchodilator reversibility test is key

Other Alternatives

• Must be considered in chronic smokers or those with relevant exposures with a 3-month cough history
• CXR here shows no mass or hilar enlargement, but central/small lesions may be CXR-occult
• Investigate with CT chest if clinical suspicion exists

• Exertional breathlessness + cough can be the presenting triad; early ILD may show only subtle reticular markings on CXR
• Consider: occupational/dust exposure, connective tissue disease history, drug exposures
• HRCT chest is the investigation of choice

• Increasingly recognized in India, especially in post-TB structural lung disease
• Can mimic TB clinically; CXR may show patchy infiltrates or early bronchiectasis

Summary Table

Immediate Work-up

1. Sputum - AFB smear x3, GeneXpert MTB/RIF, routine culture and sensitivity
2. Spirometry with bronchodilator reversibility
3. HRCT chest (CXR is normal/non-specific - CT will characterize parenchyma far better)
4. CBC, ESR, CRP - baseline and TB screening
5. 2D Echo - if cardiac cause considered
6. Detailed history: smoking pack-years, biomass fuel, occupational exposure, TB contacts, night sweats, weight loss, hemoptysis