Background: A 73-year-old female patient presented at the emergency room with cough and dyspnea. There was green sputum production and she had fever. She had given up smoking 15 years before. Her medical history was positive for recurrent bronchitis. Physical examination revealed rhonchi, a body temperature of 38.2°C and tachypnea of 35 breaths per minute. Oxygen saturation was 80% without oxygen supply. Chest radiography did not reveal a consolidation.