Identification of Criteria of the Success of the Endarterectomy in Chronic Pulmonary Post Embolic Hypertension

Inclusion Criteria: * Patients addressed to the reference centre of pulmonary hypertension for a suspected CPC-PE * Achieving an assessment prior to the operation, including:1) Right cardiac catheterization confirming HTP with a mean pulmonary arterial pressure\> 25 mm Hg at rest; 2) Echography and Doppler of the lower limbs in search of phlebitis sequela; 3) Pulmonary scintigraphy with 6 views in ventilation and perfusion; 4) Digital pulmonary angiography; 5) A 64 detector pulmonary computed tomography; 6) Having read the briefing note and given their agreement. Exclusion criteria: * Refusal examinations . * Patient for which one method is contraindicated * Patient considered not operable by the staff * Life expectancy of less than 3 months * Geographical distance for the clinical follow-up at 3 months * Renal insufficiency (creatinine clearance \<30 mL / min) * Proven allergy to iodinated contrast agents * Pregnant woman.