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Bronchopleural FistulaFeatures:%u2022Cough (with or without sputum/blood)%u2022Dyspnea%u2022Hemodynamic or respiratory compromise%u2022Post thoracic surgery (Pneumonectomy > lobectomy, Right-sided > Left-sided)Diagnosis:%u2022X-ray (2 required):%u2022High air-fluid level (normal)%u2022Low air-fluid level (abnormal)%u2022CT scan (most accurate test)Key point: A quick drop in air-fluid level is abnormal post thoracic surgery, as the lung should be filled with sterile liquid