Figure 1: Algorithm for total en-bloc spondylectomy based on tumor extension according to the WBB classification system. Dark grey areas indicate tumor extension within a vertebral body, light grey areas indicate areas resected in a piecemeal fashion, while the remaining vertebral body is resected en-bloc. Latin numerals indicate distinct surgical steps, green: posterior resection, purple: anterior resection, blue: lateral retroperitoneal resection; *Indicated areas of the vertebral body, which are dissected and separated from surrounding structures