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Hypertrophy of bronchial arteries in a CTEPH piglet model. Left lung bronchus after five weeks of pulmonary artery ligation from the piglet CTEPH model showing hypertrophied subepithelial bronchial arteries (black stars) explaining the potential occurrence of hemoptysis (HES staining). CTEPH, chronic thromboembolic pulmonary hypertension; HES, hematoxylin-eosin-saffron. Magnification ×20.
