Incidental Spine Findings¶

Overview¶

Many spine imaging findings are incidental and require no treatment, follow-up, or further workup. Recognizing incidental findings and communicating their benign nature to referring clinicians prevents unnecessary testing, patient anxiety, and healthcare costs.

Common Incidental Findings¶

Almost Always Benign — No Follow-Up Needed¶

Vertebral hemangioma — Bright T1 and T2 signal within a vertebral body with coarsened trabeculae. Present in ~10% of adults. Typical hemangiomas require no follow-up.
Tarlov cysts — CSF-signal sacral perineural cysts. Present in 5–9%. Almost always asymptomatic.
Spina bifida occulta — Incomplete posterior arch fusion at L5 or S1. Present in 10–20%. No clinical significance when isolated.
Transitional vertebra — Sacralization of L5 or lumbarization of S1. Present in 15–30%. Important for vertebral level counting, not intrinsically pathologic.
Disc dehydration — Loss of T2 signal in discs. Extremely common with age, often asymptomatic.
Schmorl nodes — Intravertebral disc herniations. Very common, usually incidental.
Limbus vertebra — Intrabody disc herniation through the ring apophysis. Benign developmental variant.

Requires Clinical Correlation¶

Disc herniation without corresponding symptoms — Very common on MRI in asymptomatic individuals (present in ~30% of asymptomatic adults over 30). Only clinically significant if it correlates with symptoms and examination findings.
Spinal stenosis — Anatomic narrowing is common and age-related; clinical significance depends on symptoms.
Modic changes — Endplate signal changes are common and may or may not correlate with pain.

Requires Follow-Up or Further Workup¶

Atypical vertebral hemangioma — Low T1 signal, aggressive features (cortical expansion, epidural extension). May require follow-up or biopsy.
Focal vertebral body lesion of uncertain etiology — Indeterminate marrow lesion on MRI; may require CT, follow-up, or biopsy.
Incidental cord signal abnormality — T2 hyperintensity within the cord requires investigation.

Clinical Pearl

Approximately 30% of asymptomatic adults over 30 have a disc herniation on lumbar MRI, and 90% of adults over 60 have disc degeneration. Reporting every degenerative finding as pathological can lead to unnecessary surgery. The radiologist's role is to determine whether imaging findings explain the patient's specific symptoms — not merely to catalog every abnormality.

Key Points¶

Most spine imaging findings are incidental and age-related
Vertebral hemangioma, Tarlov cysts, spina bifida occulta, and transitional vertebrae require no follow-up when typical
Disc herniations are present in 30% of asymptomatic adults — clinical correlation is essential
Atypical hemangiomas and indeterminate marrow lesions may require workup
Clear communication of incidental findings prevents unnecessary patient anxiety and testing

References¶

Brinjikji W, Luetmer PH, Comstock B, Bresnahan BW, Chen LE, Deyo RA, et al. Systematic literature review of imaging features of spinal degeneration in asymptomatic populations. AJNR Am J Neuroradiol. 2015;36(4):811-6. doi:10.3174/ajnr.A4173. Available from: https://www.ajnr.org/content/36/4/811
Kyere KA, Than KD, Wang AC, Rahman SU, Valdivia-Valdivia JM, La Marca F, et al. Schmorl's nodes. Eur Spine J. 2012;21(11):2115-21. doi:10.1007/s00586-012-2325-9. Available from: https://pubmed.ncbi.nlm.nih.gov/22544358/
Vertebral haemangioma. Radiopaedia.org. Available from: https://radiopaedia.org/articles/vertebral-haemangioma-2