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tors. The prick test for common pneumoallergens proved negative. Chest X-rays and computed tomography (CT) showed no significant alterations, except right basal segmental atelectasis and adenopathies of a reactive appearance ( fig. 1 ). Considering the persistent cough despite optimum treatment, bronchoscopy was decided upon, the findings being suggestive of inflammatory thickening of the dividing carinal region of the segmental bronchi of the right upper lobe (RUL; fig. 2 ). A histological study of the bronchial biopsy revealed intense acute and chronic inflammation, squamous metaplasia, and the presence within the macrophages of oval structures containing a large nucleus and a prominent kinetoplast ( fig. 3 ). What is your diagnosis? Case Report

A Very Unusual Cause of Persistent Cough Diagnosed by Bronchoscopy