A 40-year-old man with a family history of Marfan syndrome was admitted to our hospital because of acute Stanford type A aortic dissection. He underwent a Bentall operation with an artificial vascular graft. Postoperative computed tomography revealed a low-density area around the graft in the ascending aorta and at the left subclavian artery cannulation site. He showed no symptoms and was discharged uneventfully. Five months after the operation, a pulsatile subdermal tumor appeared in the center of the median sternotomy. Computed tomography showed low- and high density fluid accumulation surrounding the ascending aortic graft, and this was connected with a subdermal tumor. We suspected collapse of the anastomotic site and performed an emergency operation. The fluid around the aortic graft was clear and diagnosed as perigraft seroma. To prevent recurrence, we filled the space around the aortic graft with an omental pedicle graft. After the operation, perigraft seroma did not recurr. In addition, with the disappearance of the seroma in the mediastinum, fluid accumulation at the left subclavian artery cannulation site also disappeared.

A 46-year-old man had a 3-week history of persistent cough. Chest radiography showed a mass in the left pulmonary hilum and contrast-enhanced computed tomography (CT) showed an infiltrative mass extending from the main pulmonary trunk to the left hilar region into the lung. He was referred to our hospital for multidisciplinary treatments. Echocardiography showed that the proximal side of the tumor reached the pulmonary valve. CT revealed that the heterogeneous low-density tumor extended from the main pulmonary trunk to the left and right pulmonary arteries, and the left side of the tumor extended beyond the left pulmonary hilum into the left lung. A mass shadow of 54 mm in length was also seen in the lower lobe of the left lung along the pulmonary artery. Although the left bronchus was compressed by the tumor, there was no obvious intratracheal invasion. Direct invasion to the descending thoracic aorta was suspected. He underwent the resection of the main pulmonary trunk and the left pulmonary artery along with the tumor concomitant with total left pneumonectomy. Reconstruction of the pulmonary artery and right ventricular outflow tract were performed as follows: The right ventricular outflow tract was reconstructed by using a semilunar shaped bovine pericardial patch. The pulmonary artery was replaced by using a composite graft with a Dacron tube graft and an aortic bio-prosthesis. He was discharged on the 22nd postoperative day. The pathological diagnosis of the tumor was pulmonary artery intimal sarcoma. Although there are various reconstruction methods for pulmonary artery intimal sarcoma depending on the affected site, reconstruction of the pulmonary artery and the right ventricular outflow tract by using a composite graft are considered to be a useful method.