noun
primary pulmonary hypertension
A rare, progressive disease characterized by high blood pressure in the pulmonary arteries without an identifiable underlying cause. Used in medical contexts.
原発性肺高血圧症は指定難病の一つです。
Primary pulmonary hypertension is one of the designated intractable diseases.
Pulmonary hypertension in general; 原発性肺高血圧症 specifies the primary (idiopathic) form, while 肺高血圧症 can be secondary to other conditions.
Compound of 原発性 (primary, idiopathic), 肺 (lung), 高血圧 (hypertension), and 症 (disease). A direct medical term calqued from English 'primary pulmonary hypertension'.