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CONFIRMATORY DIAGNOSIS
| Histopathologic Features |
| Immature lobular development |
| Decreased number of pulmonary capillaries located away from the alveolar epithelium |
| Thickened alveolar septae |
| Medial hypertrophy of small pulmonary arteries and muscularization of distal arterioles |
| Malposition of pulmonary vein branches adjacent to pulmonary arteries (same adventitial sheath) |
| Lymphangiectasis (30%) |
