The case of a 24 year old male with crural paraplegia and sensitive level at T8 is reported. The thoracic spine films revealed an expansive process producing spinal cord compression and deformation of T8 vertebral body. A laminectomy was performed and the patient died by cardio-respiratory arrest during the surgery. The post-mortem examination discovered an anterior mediastinal tumor, the T8 vertebral body being involved by a mass with the same caracteristics. The histopathologic study revealed a mediastinal seminoma like-tumor, metastasizing at T8 vertebral body.