[Intrathoracic Dumbbell-shaped Schwannoma with Preoperative Identification of the Artery of Adamkiewicz:Report of a Case].

A woman in her 30s with a left posterior mediastinal tumor incidentally found on a chest computed tomography (CT) was referred to our hospital. Chest CT revealed a dumbbell-shaped tumor of 37 mm in diameter located on the paravertebral region at the left Th9/10 level. The tumor extended into the Th9 intervertebral foramen, but did not extend into the spinal canal. Three dimensional (3D)-CT showed the artery of Adamkiewicz (AKA) with a hair-pin turn from the 11th left intercostal artery. We performed surgical treatment. First, the nerve root was dissected by the posterior approach. Next, the tumor was resected by thoracoscopic surgery. The postoperative pathological diagnosis was neurinoma. In surgical resection of posterior mediastinal tumors (especially on the left side) located between the eighth thoracic vertebra and the first lumbar vertebra, it is considered important to identify AKA preoperatively in order to prevent postoperative paraplegia.