Primary (idiopathic) pulmonary hypertension.
D000792:Angiography; D001161:Arteriosclerosis; D001706:Biopsy; D001784:Blood Gas Analysis; D006328:Cardiac Catheterization; D006334:Heart Function Tests; D006801:Humans; D006976:Hypertension, Pulmonary / Q000175:diagnosis* / Q000209:etiology*; D008297:Male; D008875:Middle Aged; D013902:Radiography, Thoracic; D011877:Radionuclide Imaging; D012129:Respiratory Function Tests