All are the histological features of Pulmonary hypertension -a) Capillaritis of alveolar septab) Saddle thrombi in pulmonary trunkc) Thrombi in pulmonary vasculature d) Vaso-occlusive diseasee) Arterial wall thicken
Pulmonary Hypertension 

In pulmonary hypertension pathological changes are seen from main pulmonary arteries to arterioles. They are :
(a) Arterioles and small pulmonary arteries :
	(i) Medial hypertrophy
	(ii) Thickening and reduplication of elastic lamina.
	(iii) Plexiform pulmonary arteriopathy in which intraluminal tuft of capillary formation occurs in dilated thin walled arteriolar branches.

(b) Medium sized Pulmonary arteries :
	(i) Medial hypertrophy; which is not marked in secondary pulmonary hypertension.
	(ii) Concentric intimal thickening
	(iii) Adventitial fibrosis
	(iv)Thickening and reduplication of elastic laminae.

(c) Large Pulmonary arteries :
Atheromatous deposits
Vasoocclusive disease itself may lead to pulmonary hypertension.
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