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Complete lung collapse in a young adolescent. Bronchial carcinoid tumours (BCTs) arise from the neuroendocrine cells of the bronchial epithelium known as Kulchitsky cells. They represent ~25% of all carcinoid tumours, usually have a central distribution, and present with features of bronchial obstruction. They are the most common lung malignancy in children. Here we report the case of a 14-year-old girlwith chronic respiratory symptoms and left lung collapse due to bronchial carcinoid. The differential diagnosis of segmental, lobar or total lung collapse in a young person also includes mucus plugging or foreign body aspiration.