Aortico-pulmonary paraganglioma: case report and Japanese review.

Aortico-pulmonary paraganglioma (APPG) is a rare middle mediastinal tumor. We experienced a case of APPG in a 52-year-old man. Chest computed tomography and magnetic resonance imaging revealed a multicystic mass in the subaortic area. A left thoracotomy was performed without definitive preoperative diagnosis. The tumor was strongly adherent to the pericardium and the surrounding large vessels, but a complete resection was undertaken. Histological and immunohistochemical examination revealed that it was a malignant paraganglioma with a microscopically positive surgical margin. After radiotherapy of 50 Gy for the mediastinum, the patient almost recovered from his hoarseness by thyroplasty. We also reviewed nine Japanese cases of APPG reported previously. Though APPG is rare, we must consider that a middle mediastinal tumor may be APPG, dpreoperative examination and preoperative planning are necessary to prevent massive bleeding and microscopic residual tumor.