Review Question - QID 214991

A 63-year-old woman presents to her primary care provider with new-onset cough, night sweats, and hemoptysis since last week. The patient grew up in Bangladesh and immigrated to the United States when she was 35 years old. Her only medical condition is polycystic kidney disease, for which she received a kidney transplant 8 months ago. Her temperature is 98°F (36.7°C), blood pressure is 122/75 mmHg, pulse is 85/min, and respirations are 16/min. On lung auscultation, inspiratory crackles are present. A chest radiograph is ordered and a new cavitary lesion is noted in the apical-posterior segment of her left upper lobe. Which of the following is the most appropriate explanation for the apical location of this patient's radiography findings?