Lumbosacral radiculopathy is a very common pathology, frequently caused by degenerative spondyloarthropathies. However, radiculopathy may result from tumor in various locations within the spinal canal, more commonly extramedullary. Primary nerve root tumors are a rare cause of lumbosacral radiculopathy. The majority of primary spinal tumors are benign and slow growing, and their clinical manifestations may be difficult to distinguish from more common causes of radiculopathy, such as a disc herniation. To our knowledge, voluminous schwannomas with endoabdominal development have only rarely been observed. Lumbosacral radiculopathy is a common neurological syndrome which can be an important source of disability. Although the most common causes are disc herniation and chronic spinal arthropathy, physicians should be mindful of other causes, including neoplasms.