Source:http://linkedlifedata.com/resource/umls/id/C0034091
MSH: Pathological process resulting in the fibrous obstruction of the small- and medium-sized PULMONARY VEINS and PULMONARY HYPERTENSION. Veno-occlusion can arise from fibrous proliferation of the VASCULAR INTIMA and VASCULAR MEDIA; THROMBOSIS; or a combination of both.,NCI: A disorder characterized by pulmonary venous constriction or occlusion, resulting in pulmonary hypertension.