Abstract
A 24-year-old woman complained of pain and swelling of the left-sided cervix. Cervical echography revealed congestion of the left cervical vein. Both chest CT and MRI revealed a tumor in the anterior mediastinum, which compressed the innominate vein and showed thrombus formation. The tumor was suspected to be a mature teratoma complicated with mediastinitis and thrombophlebitis of the innominate vein. We resected the tumor and removed the thrombus through a median sternotomy. The histological diagnosis of the resected tumor was a mature teratoma. This mature teratoma associated with thrombophlebitis of the innominate vein is the first reported case as far as we know.
