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Intra-operative MRI-assisted spinal localization

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Summary

Background

Level localization in the thoracic spine can be problematic. We describe a new method that can be used in difficult cases, e.g., ones where lesions are mid-thoracic, small, or only visible on MRI.

Methods

Intra-operatively, a midline incision was made and the thoracic spinous processes were exposed. A length of contrast-filled tubing was wound around the processes and the incision was temporarily closed and the patient was transferred to the radiology department for MRI under general anesthetic. Upon return to theatre, the cross sections of contrast-filled tubing and the lesion itself were visible on the MRI scan, allowing localization of the level.

Findings

This method was accurate and minimized the extent of bone removal required for access.

Conclusions

This technique, while not appropriate in every case, is repeatable, and does not require specialized equipment or training. It is an extremely accurate method of localization for difficult cases.

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Correspondence to Chris Barrett.

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Comments

Localization in the thoracic spine can be challenging, particularly in the setting of minimally invasive surgery. However, this localization technique seems like "a long run for a short slide". I have found counting ribs on an x-ray with a radiopaque marker in place to be very accurate, particularly when counting from below and assuming pre-operative confirmation of the actual number of ribs present. A pre-operative skin incision and muscle dissection over four or five segments that is subsequently closed for transport to the imaging device is hardly trivial. I would consider less risk to extend a bony exposure a level or two in order to find a mis-localized lesion in the unusual circumstance where radiographic localization fails.

H. Louis Harkey

Mississippi, USA

As a technical note, the authors report, an ingenious procedure to localize lesions in the thoracic spine, a region of difficult surgical navigation. The described technique takes advantage of per-operatively implanted gadolinium-enhanced interspinous process markers that are, thus, later co-registered with the surgical lesion. Being a two-staged procedure that implies the displacement of patients from the OR to the MRI suite and return, may not feasible in many hospitals worldwide. As the intra-operative transfer of patients to MRI may not be devoid of risks, and neuronavigational systems are time consuming, I still stand with more basic techniques.

Oscar Alves

Porto, Portugal

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Barrett, C., English, P., Evans, J. et al. Intra-operative MRI-assisted spinal localization. Acta Neurochir 152, 669–673 (2010). https://doi.org/10.1007/s00701-009-0543-7

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  • DOI: https://doi.org/10.1007/s00701-009-0543-7

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