Concurrent pulmonary hypoplasia and congenital lobar emphysema in a young dog with tension pneumothorax: a rare congenital pulmonary anomaly

Right lateral (a) and dorsoventral (b) thoracic radiographs before emergent thoracocentesis. Large volume of air is retained in the left pleural cavity representing loss of sternal contact of the heart, gas in the left hemithorax, right mediastinal shift, and caudal displacement of the diaphragm with diaphragmatic tenting. The left cranial and caudal lung lobes are collapsed, while the left cranial lung lobe is hyperlucent with scant vascular markings (white arrows) compared to the other collapsed lung lobe