When a proper detailed history, clinical examination, chest X ray and sputum analysis does not yield a definite diagnosis for the cause of chronic cough, bronchoscopy is indicated. We did a descriptive study among 39 patients who underwent bronchoscopic evaluation for chronic cough (more than 4 weeks) with normal chest X ray and without a prior definitive diagnosis. 16 out of 39 patients were diagnosed to have tuberculosis on analysis of the bronchial washings. 6 patients (66.67%) with left upper lobe mucosal inflammation were AFB smear positive. 5 patients ( 31.25 %) with normal bronchoscopy were AFB smear positive.4 out of 5 patients (80 %) with bilateral upper lobe mucosal inflammation were AFB smear positive. Pulmonary tuberculosis can present with chronic non productive cough and normal chest X ray. Bronchoscopy is helpful in establishing the diagnosis. When bronchoscopy shows bilateral or unilateral upper lobe bronchial mucosal inflammation, possibility of tuberculosis is high. Bronchoscopy can be normal in some patients with pulmonary tuberculosis with normal chest x ray and chronic non productive cough. The key message is that early pulmonary tuberculosis can present with chronic non productive cough and normal chest X ray without any other symptoms suggestive of tuberculosis. Bronchoscopy is helpful in establishing the diagnosi
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