“…For instance, chapter 3 discusses ILDs and covers differential diagnosis, definitions, clinical phenotype, radiological classifications and histological characterisation [4]. Section 4 covers rare diseases of the airways or alveoli, such as bronchiolitis [8] and alveolar proteinosis [9], as well as primary ciliary dyskinesia [10], cystic fibrosis [11], bronchiectasis [12] and α 1 -antitrypsin deficiency [13]. Section 5 provides a comprehensive overview of pulmonary vascular diseases, including pulmonary arterial hypertension [14], chronic thromboembolic PH [15], and PH complicating the course of other rare lung diseases [16].…”