A 6-year-old child presents with a 10-day history of acute otitis media treated with amoxicillin. Over the past 3 days, he has developed postauricular pain, swelling, and erythema with anterior displacement of the pinna. On examination, the mastoid tip is tender and fluctuant. A plain mastoid X-ray (Schüller view) shows the finding marked **A** in the diagram. Which of the following best describes the pathological process occurring at this site?
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