Line of blood that discovers the bronchus that causes hemoptysis.
Sometimes the bronchoscopy can establish the anatomical origin of the hemoptysis, although a trace as clear as the one of the photograph should not be expected. Usually the fresh blood is distributed by the cough and the oldest one coagulates and fragments, so it is seen in different areas of the airway. Then the bronchoscopist makes silence. To ensure the origin of hemoptysis, it is imperative to observe the production and reproduction of blood from the same bronchus.