This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bronchopulmonary Segments, Embryonic veins, Subject name: Anatomy
A patient presents with chest pain due to aspiration pneumonitis. On examination there is dullness on percussion in area medial to the medial border of scapula on elevation of arm. Which pa of the lung is most likely to be affected? 
Select and explain. 
A. Right superior BPS, B. Right posterior BPS, C. Left superior BPS, D. Right medial basal BPS
A: Right superior BPS
Answer: A: Right superior BPS 
Explanation: Upon elevation of arm, medial border of scapula corresponds to the oblique fissure of lung on the posterior thorax. Medial to that lies the apex of lower lobe of the lung. This is the location of the apical (superior) BPS of right lower lobe, which is a common site of aspiration pneumonitis. As right primary bronchus is shoer in length , has wider lumen , is more veical hence more prone for aspiration and leading to aspiration pneumonitis