Case 1:A 73-year-old man was transported to our hospital for evaluation of sudden onset of chest pain, back pain, and dyspnea. We initially misdiagnosed him with advanced esophageal cancer accompanied by mediastinal metastasis;however, subsequent multi-detector row computed tomography (MDR-CT) confirmed the diagnosis. We performed coil embolization of a bronchial artery aneurysm and thoracic endovascular aortic repair( TEVAR) to seal the root of the bronchial artery. Case 2:An 81-year-old woman with a one-week history of fever and cervical pain was diagnosed with a ruptured infected thoracic aneurysm. She underwent the same treatment as described in Case 1. Physicians should consider it as a differential diagnosis of mediastinal hematoma.