A 58-year-old man with a history of COPD presents to the emergency department with acute onset pleuritic chest pain, dyspnea, and scant hemoptysis. CT pulmonary angiography (CTPA) is performed. The structure marked **A** in the diagram shows a pleural-based wedge-shaped opacity with its apex directed toward the hilum. Which of the following best explains the pathophysiology underlying this radiological finding?
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