pulmonary veno-occlusive disease and/or pulmonary capillary haemangiomatosis (MONDO_0018554) is a rare subgroup of pulmonary arterial hypertension (PAH) characterized by obliterative fibrosis of the small pulmonary veins and venules and/or capillary infiltration of the pulmonary interstitium leading to increased pulmonary vascular resistance and right ventricular dysfunction. Also known as: PVOD and/or PCH.