Neumann D P, Scholl R J, Kellet H M, Simon R H
Department of Radiology, University of Connecticut School of Medicine, Farmington, USA.
Conn Med. 1998 Sep;62(9):527-30.
Ependymomas typically occur in the brain and spinal cord, and represent 5% and 16% of primary intracranial and spinal cord tumors respectively. Ependymomas arising outside the central nervous systems are uncommon and when they do occur are usually seen in the sacrococcygeal region. Other reported sites include the pelvis, spinal nerve roots, and lung. An extraspinal mediastinal ependymoma is a rare occurrence, with only two previously reported cases to our knowledge. In both instances, the lesion arose in the posterior mediastinum, and were imaged with either chest radiographs alone or chest radiographs and computed tomography. In our case, plain radiography was followed by magnetic resonance imaging. This report documents the clinical, pathological, and magnetic resonance imaging findings in a case of a posterior mediastinal ependymoma. Primary mediastinal ependymomas are rare lesions that may be considered in the differential diagnosis of a posterior mediastinal mass.
室管膜瘤通常发生于脑和脊髓，分别占原发性颅内肿瘤和脊髓肿瘤的5%和16%。发生于中枢神经系统外的室管膜瘤并不常见，一旦发生，通常见于骶尾区域。其他报道的部位包括骨盆、脊神经根和肺。脊柱外纵隔室管膜瘤极为罕见，据我们所知，此前仅有两例报道。在这两例中，病变均发生于后纵隔，仅通过胸部X线片或胸部X线片与计算机断层扫描进行成像。在我们的病例中，先进行了X线平片检查，随后进行了磁共振成像检查。本报告记录了一例后纵隔室管膜瘤的临床、病理及磁共振成像表现。原发性纵隔室管膜瘤是罕见病变，在鉴别诊断后纵隔肿块时应予以考虑。
