[X-ray computed tomographic detection of foraminal neurinoma. Apropos of a case]

About the case of the vertebral neurilemmoma diagnosed at the very beginning, purely inside the foramen, precursor of the classical "hourglass Tumor", the authors remain the clinical evolution and the anatomy of the intervertebral foramen's neurilemmoma. They insist on the insufficiency of the conventional radiology in early diagnosis. They also exposed the C.T. technic and his results; the neurilemmoma can be diagnosed before his extension over the limits of the intervertebral foramen, but only if a precis neurological level is known.