Spine Tumors Overview¶

Summary¶

Spinal tumors are classified by compartment — extradural, intradural extramedullary, and intramedullary — a framework that drives the differential diagnosis and the imaging workup. Extradural disease dominates by volume because vertebral metastases (breast, lung, prostate, kidney, thyroid), myeloma, and lymphoma far outnumber primary spinal neoplasms; among benign primary lesions, vertebral hemangioma is the most common. In the intradural extramedullary compartment, meningioma and nerve sheath tumors (schwannoma, neurofibroma) predominate in adults. Intramedullary tumors are dominated by ependymoma in adults and astrocytoma in children. MRI with contrast is the primary modality; CT is used for matrix characterization, cortical bone, and biopsy planning; bone scintigraphy and FDG PET/CT serve staging roles. Compartmental localization on MRI relies on the relationship between tumor, subarachnoid space, and the outer cord contour. Age, lesion topography, and pedicle involvement are the highest-yield discriminators between benign and malignant disease.

Introduction¶

Spinal tumors are broadly categorized by their relationship to the dura mater and spinal cord into three compartments: extradural, intradural extramedullary, and intramedullary. This anatomical classification is fundamental to radiology because the compartment of origin strongly narrows the differential diagnosis and the imaging appearance — particularly on MRI — often allows confident localization.

Epidemiology¶

Metastatic disease is by far the most common spinal neoplasm, accounting for approximately 70% of all spinal tumors. Among primary spinal tumors, the most common are vertebral hemangiomas (often incidental), nerve sheath tumors (schwannoma, neurofibroma), and meningiomas. Primary malignant bone tumors of the spine are rare.

Clinical Presentation¶

Pain — The most common presenting symptom; may be mechanical (worse with activity) or oncologic (worse at night, progressive, unrelenting)
Neurological deficit — Weakness, sensory changes, bowel/bladder dysfunction depending on the level and compartment
Pathological fracture — Vertebral body collapse through tumor-weakened bone
Incidental finding — Many benign lesions (hemangiomas, small schwannomas) are discovered incidentally on MRI

Imaging Approach¶

MRI¶

MRI is the primary modality for evaluating spinal tumors:

T1-weighted — Evaluates marrow replacement (tumor replaces bright fatty marrow with dark signal)
T2-weighted — Characterizes tumor signal and relationship to the cord and thecal sac
STIR — Most sensitive for detecting marrow infiltration
Post-contrast T1 with fat saturation — Essential for evaluating enhancement pattern, leptomeningeal disease, and intramedullary lesions
Diffusion-weighted imaging (DWI) — Helps distinguish malignant from benign compression fractures

CT¶

Best for evaluating cortical bone destruction, matrix mineralization (chondroid, osteoid), and fracture risk
CT-guided biopsy for tissue diagnosis

Nuclear Medicine¶

Bone scintigraphy for detecting multifocal osseous metastatic disease
PET/CT (FDG) for staging, treatment response assessment, and distinguishing active tumor from post-treatment changes

Red Flags Suggesting Malignancy¶

Pain worse at night or at rest
Age >50 with new-onset back pain and weight loss
Known primary malignancy (breast, lung, prostate, kidney, thyroid)
Vertebral body destruction with pedicle involvement
Pathological fracture with soft tissue mass
Multiple vertebral lesions

Clinical Pearl

The pedicle is the most reliable structure for distinguishing benign from malignant vertebral body lesions. Benign compression fractures (osteoporotic) almost never involve the pedicle, while metastatic disease frequently destroys or infiltrates the pedicle. The "winking owl" sign on AP radiograph — absence of a pedicle — is a classic indicator of metastatic disease.

Key Points¶

Spinal tumors are classified by compartment: extradural, intradural extramedullary, and intramedullary
Metastatic disease is the most common spinal tumor overall
MRI with contrast is the primary imaging modality
Pedicle involvement is a key distinguishing feature of malignancy
The compartment of origin strongly predicts the differential diagnosis

References¶

Ledbetter LN, Leever JD. Imaging of intraspinal tumors. Radiol Clin North Am. 2019;57(2):341-357.
Patnaik S, Jyotsnarani Y, Uppin SG, Susarla R. Imaging features of primary tumors of the spine: a pictorial essay. Indian J Radiol Imaging. 2016;26(2):279-289.
Van Goethem JWM, van den Hauwe L, Özsarlak Ö, De Schepper AMA, Parizel PM. Spinal tumors. Eur J Radiol. 2004;50(2):159-176.
Rodallec MH, Feydy A, Larousserie F, et al. Diagnostic imaging of solitary tumors of the spine: what to do and say. RadioGraphics. 2008;28(4):1019-1041.
Kushel YV, Belova YD. Comparative epidemiology of adult and pediatric intramedullary spinal cord tumors. Zh Vopr Neirokhir Im N N Burdenko. 2015;79(6):22-28.
Gaillard F, et al. Spinal tumours. Radiopaedia.org. https://radiopaedia.org/articles/spinal-tumours. Accessed May 13, 2026.