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A 79-year-old woman has had increasing malaise and a 5-kg weight loss over the past 5 months. She has had a chronic nonproductive cough for 3 months. On physical examination she has no abnormal findings. Pulmonary function tests are normal. Her peripheral blood counts are normal. Her chest radiograph is shown in the figure. What is a biopsy of one of her lung lesions most likely to show?