left main bronchus

Also found in: Wikipedia.

left main bron·chus

[TA] Avoid the incorrect term left main stem (or mainstem) bronchus.
primary division of the tracheobronchial tree arising as the left branch of the bifurcation of the trachea, then passing in front of the esophagus and enters the hilum of the left lung where it divides into a superior lobe bronchus and an inferior lobe bronchus. It is longer, of narrower caliber, and more nearly horizontal than the right main bronchus, hence, aspirated objects enter it less frequently.
References in periodicals archive ?
The left main bronchus was most susceptible to EBTB, and most posttuberculosis airway scarring stenosis length was 1.
Left main bronchus is smaller in size and a bit angulated, thus making it easy for a foreign body to enter right main bronchus.
53% of the foreign bodies were in the right main bronchus, 36% in the left main bronchus and 11% in the trachea.
Ford and colleagues in a complex distal fistula passed two separate MLT tubes into each bronchus, however they experienced difficulty in positioning larger cuff of MLT tube in left main bronchus.
A raised area of white tissue was observed on the lateral aspect of the left main bronchus at the level of the bifurcation and, at the time of the examination, was considered excessive cartilaginous tissue.
A 32-year-old woman with an adenoid cystic carcinoma of the left upper lobe developed an almost complete stenosis of the left main bronchus and the left upper lobe bronchus.
The singularity of our case of left upper PAPVR is represented by the curved route of the anomalous vein, which determines the presence of a venous vessel with a normal diameter located anteriorly to the left main bronchus before its curved route, contrary to all of the cases of upper left-sided PAPVR reported in the literature.
All of them were women in the age group of 15 to 35 years and all had positive chest radiography findings while commonest anatomical location was left main bronchus," the study conducted by Manzoor Ahmad Latoo, Zafarullah Beig and Aleena Shafi said.
The above was a complex case of aortic dissection in a patient with the Marfan syndrome complicated with an anastomotic leak and compressive aneurism on the trachea and the left main bronchus, also with a subdural hematoma, appeared under anticoagulant therapy--the treatment requiring multidisciplinary efforts.
A second child presented with a chronically obstructed left main bronchus with destruction of the entire left lung.