Abstract
Table 1 summarizes the results of five large pathology series published during the past 20 years. The great majority of patients with PPH had wide spread abnormalities only in the arterial side of the pulmonary circulation at autopsy or lung biopsy and were classified as having pulmonary hypertensive arteriopathy. In a small percentage of cases, the hypertensive changes did involve primarily the venous pulmonary circulation, and the patients were classi fied as having pulmonary veno-ocelusive disease. In some cases, the diagnosis of PPH could not be confirmed histopathologically.
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