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Research ArticleTumor

Tumor Occupancy Ratio-An Imaging Characteristic Prognosticating the Surgical Outcome of Benign Intradural Extramedullary Spinal Cord Tumors

Prashant Raj Singh, Tarun Kumar Pandey, Raghavendra Kumar Sharma, Faran Ahmad, Ankur Kumar and Abhay Agarwal
International Journal of Spine Surgery May 2021, 8077; DOI: https://doi.org/10.14444/8077
Prashant Raj Singh
1Department of Neurosurgery, All India Institute of Medical Sciences, Raipur, India
DNB
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Tarun Kumar Pandey
2Department of Neurosurgery, Vivekananda Polyclinic and Institute of Medical Sciences, Lucknow, India
MS, MCH
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Raghavendra Kumar Sharma
1Department of Neurosurgery, All India Institute of Medical Sciences, Raipur, India
MS, MCH
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Faran Ahmad
2Department of Neurosurgery, Vivekananda Polyclinic and Institute of Medical Sciences, Lucknow, India
DNB
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Ankur Kumar
2Department of Neurosurgery, Vivekananda Polyclinic and Institute of Medical Sciences, Lucknow, India
DNB
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Abhay Agarwal
2Department of Neurosurgery, Vivekananda Polyclinic and Institute of Medical Sciences, Lucknow, India
MS, DNB
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ABSTRACT

Background Intradural extramedullary (IDEM) spinal cord tumors are two thirds of all spinal tumors. We have prospectively analyzed the importance of the tumor occupancy ratio as a factor for predicting the course of the disease and in prognosticating the surgical outcome in patients with IDEM tumors.

Methods We prospectively analyzed 44 consecutive cases of IDEM tumors, diagnosed as cervical, thoracic, and lumbar IDEM tumors (excluding conus/cauda equina lesion) by magnetic resonance imaging (MRI), that were operated on at our institution between 2014 and 2016. We measured the tumor occupancy ratio and noted the sagittal and axial location of the tumor in the preoperative MRI and performed the laminectomy and unilateral medial facetectomy. A primary outcome has been noted according to the gait disability score in the preoperative period and in the follow-up period of 1 year. In the statistical analysis, categorical variables were compared using a chi-square test, and an analysis of variance and student t tests were used for the continuous variables. P < .05 was considered statistically significant.

Results The tumor occupancy ratio showed a significant association to the preoperative gait disability score (P < .001) and also predicted that the surgical outcome is much better in patients with tumors with a low tumor occupancy ratio than in patients with tumors with a high occupancy ratio (P < .001). No difference in the tumor occupancy ratio was noted in 2 different pathological tumors, and there was also no difference in the tumor occupancy ratio at different sagittal and axial locations of the tumor.

Conclusion Tumor occupancy ratio has shown a significant impact on the preoperative course and also predicts the surgical outcome in patients with IDEM tumors. Hence, it is an important imaging characteristic to prognosticate the outcome in IDEM tumors and should be noted in each case.

Footnotes

  • Disclosures and COI: None declared.

  • This manuscript is generously published free of charge by ISASS, the International Society for the Advancement of Spine Surgery. Copyright © 2021 ISASS
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International Journal of Spine Surgery: 19 (S2)
International Journal of Spine Surgery
Vol. 19, Issue S2
1 Apr 2025
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Tumor Occupancy Ratio-An Imaging Characteristic Prognosticating the Surgical Outcome of Benign Intradural Extramedullary Spinal Cord Tumors
Prashant Raj Singh, Tarun Kumar Pandey, Raghavendra Kumar Sharma, Faran Ahmad, Ankur Kumar, Abhay Agarwal
International Journal of Spine Surgery May 2021, 8077; DOI: 10.14444/8077

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Tumor Occupancy Ratio-An Imaging Characteristic Prognosticating the Surgical Outcome of Benign Intradural Extramedullary Spinal Cord Tumors
Prashant Raj Singh, Tarun Kumar Pandey, Raghavendra Kumar Sharma, Faran Ahmad, Ankur Kumar, Abhay Agarwal
International Journal of Spine Surgery May 2021, 8077; DOI: 10.14444/8077
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