Does the left main bronchus belong to the upper lobe or the lower lobe?
Disease description:
During my physical examination, the doctor told me that there was a shadow in the left main bronchus, possibly indicating lung cancer. Does the left main bronchus belong to the upper lobe or the lower lobe?
Doctor's answer (2)
Dr. Wang Shishou
Hello, the left main bronchus is relatively long and divides into the upper lobe bronchus and the lower lobe bronchus, which enter the upper and lower lobes of the left lung, respectively. The human respiratory tract comprises the nasal cavity, pharynx, trachea, right and left main bronchi, lobar bronchi, and ultimately the lungs. The condition you described likely involves the bronchial portion—prior to entry into the lung parenchyma. The lungs occupy both sides of the thoracic cavity: the left lung consists of two lobes, whereas the right lung has three lobes.
