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Figure 19a. Dirofilariasis in an asymptomatic 14-year-old girl with a solitary pulmonary nodule. (a) Chest radiograph shows a soft-tissue-opacity nodule in the right upper lung. (b) Photomicrograph (original magnification, x40; Masson stain) obtained after surgical resection shows an infarcted peripheral vessel surrounded by necrotic lung tissue. Some remnants of the parasites are present in the lumen (arrows).
