<prompt> The corduroy sign refers toVeically oriented thickened trabeculae in hemangiomaHorizontally oriented thickened trabeculae in hemangiomaVeically oriented thickened trabeculae in chordomaHorizontally oriented thickened trabeculae in chordoma  <response>: The corduroy sign refers to veically-oriented, thickened trabeculae seen in intraosseous haemangiomas of the spine. It is the sagittalcoronal equivalent of the polka-dot sign seen on axial imaging. It is caused by the replacement of the normal cancellous bone by thickened veical trabeculae surrounded by fat marrow or vascular lacunae in intraosseous haemangiomas. 