下圖為一位41 歲女性腰椎之磁振造影矢狀面T1 及T2 影像。第四及第五腰椎體內中央部分有橫向之高訊號變化。請問此高訊號的骨髓變化為何?
infectious spondylitis
transverse fracture of vertebral bodies
metastases
fatty replacement of central aspect of vertebral bodies