This editorial introduces a new European Respiratory Review series focusing on clinical, radiological and histopathological features in pulmonary hypertension. https://bit.ly/3RtiFVK Pulmonary hypertension (PH) is defined as the presence of a mean pulmonary arterial pressure >20 mmHg [1]. This simple haemodynamic definition encompasses a heterogenous collection of conditions. It is now appreciated that although treatable forms of PH are relatively rare, PH itself is not an uncommon entity, affecting
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