This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Skeletal system, Subject name: Radiology
The corduroy sign refers to 
Select and explain. 
A. Veically oriented thickened trabeculae in hemangioma, B. Horizontally oriented thickened trabeculae in hemangioma, C. Veically oriented thickened trabeculae in chordoma, D. Horizontally oriented thickened trabeculae in chordoma
A: Veically oriented thickened trabeculae in hemangioma
Answer: A: Veically oriented thickened trabeculae in hemangioma 
Explanation: The corduroy sign refers to veically-oriented, thickened trabeculae seen in intraosseous haemangiomas of the spine. It is the sagittal/coronal 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.