Chronic Thromboembolic Pulmonary Hypertension Complicated by Giant Pulmonary Artery Aneurysm.

A pulmonary artery (PA) aneurysm is an extremely rare condition that can be idiopathic or secondary. Only a few reports on giant PA aneurysms associated with chronic thromboembolic pulmonary hypertension (CTEPH) are available in the literature. Here, we present a case of CTEPH associated with a secondary giant PA aneurysm detected by autopsy. A 68-year-old woman was diagnosed with pulmonary hypertension (PH) and a PA aneurysm with a diameter of 7.5 cm 7 years before admission. CTEPH was suspected as the cause of PH; however, she refused to undergo surgical treatment. Although her condition improved temporarily with pulmonary vasodilators, she had recurrence of heart failure and died because of the deterioration of her general condition. An autopsy revealed a giant PA aneurysm without medial degeneration, suggesting a secondary PA aneurysm associated with PH. Histological findings indicated multiple organized thrombi with recanalization in the PA bilaterally, and CTEPH was diagnosed as the cause of PH. Although rare, when a PA aneurysm is detected, it is important to consider that CTEPH might be associated with a giant PA aneurysm. A better understanding of this condition is necessary to improve the therapeutic strategy.