What are the histologic findings of idiopathic pulmonary arterial hypertension (IPAH)?

Updated: Jul 08, 2020
  • Author: Ronald J Oudiz, MD, FACP, FACC, FCCP; Chief Editor: Zab Mosenifar, MD, FACP, FCCP  more...
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Several histologic subtypes are associated with pulmonary arteriopathy in IPAH, one of which involves in situ thrombosis. Thrombotic pulmonary arteriopathy may be observed, with or without plexiform lesions. It is characterized by in situ thrombosis of small muscular arteries of the pulmonary vasculature. Thrombotic pulmonary arteriopathy is often present at earlier stages of IPAH (ie, before the development of plexogenic pulmonary arteriopathy) or as an irreversible lesion in later stages. Platelet activation and increased levels of circulating procoagulant factors are observed.

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