A 62-year-old former smoker presents with a 3-month history of chronic cough and 5 kg weight loss. High-resolution CT chest reveals a 2.8 cm peripheral mass in the right upper lobe. The structure marked **A** shows a spiculated margin with a linear band of soft tissue tethering the mass to the visceral pleura (pleural tag). Which of the following best describes the pathologic basis of these imaging findings?
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