A 60-year-old woman is brought to the hospital due to progressive shortness of breath and cough for 2 weeks. The patient was diagnosed with right breast cancer and completed radiation therapy 6 weeks ago. Temperature is 37.3 C (99.1 F), blood pressure is 110/70 mm Hg, pulse is 90/min, and respirations are 22/min. Oxygen saturation is 93% on room air. Examination reveals inspiratory crackles over the right lung anteriorly; the lungs are otherwise clear to auscultation. Chest radiograph shows ground-glass opacities in the right lung where radiation was delivered. Laboratory studies reveal no significant changes. Acute radiation-induced lung injury is suspected. Histopathologic examination would most likely reveal formation of which of the following?
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