Weinstein-Boriani-Biagini surgical staging for spinal tumors, the transverse plane, and into five layers (A to E, from the paravertebral extraosseous region to the dural involvement). [40]. (A) Extraosseous (soft tissues), (B) intraosseous (superficial), (C) intraosseous (deep), (D) extraosseous (extradural), (E) extraosseous (intradural), and (M) metastasis.
