Pulmonary venous occlusion This feature can be observed by histological examination of lung tissue. The feature can be seen in pulmonary veno-occlusive disease (PVOD). PVOD is characterized by diffuse occlusion of the pulmonary veins by fibrous tissue, pulmonary venous congestion and associated complications including severe pulmonary hypertension (pHTN), non-cardiogenic pulmonary edema, hypoxia and right-ventricular failure. Clinical presentation is typically non-specific, including dyspnea, fatigue and cough. Pulmonary venous stenosis UMLS:C4280802 Substantial narrowing or blockage of small pulmonary veins as a result of disorganized smooth muscle hypertrophy and collagen matrix deposition. HP:0006518 UMLS:C0034091 SNOMEDCT_US:89420002 Fyler:3002 Pulmonary venoocclusive disease Abnormal pulmonary vein morphology