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Chapter Summary
• Context: Spinal neoplasms represent a complex, heterogeneous group of oncological entities whose management requires the precise integration of tumor biology, 3D spinal anatomy, neurological function, mechanical stability, and patient systemic performance status. Although metastases are the most common spinal tumors, primary benign and malignant bone tumors, hematological neoplasms (multiple myeloma, plasmacytoma), and intradural tumors demand dedicated diagnostic algorithms. The anatomical proximity of the spinal cord, nerve roots, vertebral arteries, aorta, and visceral organs severely restricts the direct application of classical musculoskeletal limb salvage techniques, making wide en bloc margins technically formidable. Crucially, an ill-planned biopsy or unplanned intralesional debulking can contaminate anatomical planes, preclude en bloc spondylectomy, and destroy curative potential. The chapter structures oncological decision-making through histogenesis, Enneking staging, the Weinstein-Boriani-Biagini (WBB) surgical classification, systemic staging, functional performance scales (ECOG, KPS), and multidisciplinary Tumor Board collaboration.
• Chapter Objective: To establish the diagnostic, staging, and therapeutic foundations for spinal neoplasms. The reader will master how tumor histology and biological behavior drive management, properly plan percutaneous image-guided biopsy, apply the Enneking and WBB classification systems, understand the clinical meaning of oncological surgical margins (intralesional, marginal, wide), and integrate local tumor control, neurological decompression, mechanical stabilization, and patient preferences.
• Tumor biology precedes surgical techniqueThe chapter emphasizes histogenesis and biological aggressiveness (Table 51.1). Cell lineage dictates radiosensitivity, systemic chemotherapy response, and overall prognosis. The Enneking musculoskeletal staging system categorizes benign and malignant lesions by histological grade (G0-G2), anatomical compartment (T0-T2), and distant metastasis (M0-M1).
• The WBB staging system transforms anatomy into surgical strategyThe Weinstein-Boriani-Biagini (WBB) classification (Figure 51.3) maps the cross-sectional vertebra into 12 clock-face radial zones and 5 concentric tissue layers. This 3D mapping provides a standardized anatomical language to evaluate epidural involvement, plan surgical margins, and determine feasibility of en bloc resection.
• Biopsy as the first oncological actAn unknown spinal lesion must be biopsied without compromising definitive curative surgery. The biopsy tract must be planned so it can be completely excised during definitive en bloc resection. Image-guided percutaneous transpedicular trochar biopsy (Figure 51.4) is the gold standard. Incisional open biopsy is reserved for failed needle biopsies under strict oncological precautions.
• Multimodal diagnostic workupRadiographs evaluate mechanical deformity; CT details cortical architecture and pedicle channels; MRI evaluates epidural compression, cord signal, and paraspinal soft-tissue extension (Figure 51.5); PET-CT/scintigraphy assesses systemic spread; and spinal angiography maps hypervascular tumors (renal, thyroid) for preoperative embolization. Functional performance scales (ECOG, KPS) establish patient physiological reserve.
• Surgical margins and therapeutic intentInterventions range from observation, curettage, and planned intralesional decompression to total en bloc spondylectomy (TES) (Figure 51.8, Table 51.5). Oncological margin ambition must be balanced against neurological sacrifice and systemic frailty. Stereotactic body radiotherapy (SBRT), targeted systemic therapies, and separation surgery represent central modern components.
• Clinical Application: In clinical practice, when an unknown destructive spinal lesion is discovered, the first decision is never 'how to resect it', but 'how to reach an accurate histological diagnosis safely'. Before performing a biopsy, full-neuraxis MRI, contrast CT of the chest/abdomen/pelvis, and systemic workup must be completed. A percutaneous transpedicular biopsy route prevents extraosseous track contamination. Once histology is confirmed, the multidisciplinary Tumor Board determines curative versus palliative intent. In solitary primary malignant tumors (chordoma, chondrosarcoma, early osteosarcoma), total en bloc spondylectomy with wide margins offers the only chance for long-term cure. In radioresistant metastases or hematological tumors with cord compression, separation surgery (creating a 2-3 mm CSF buffer around the thecal sac) followed by adjuvant high-dose SBRT achieves durable local control with minimal surgical morbidity.
