Erratum. A points-based algorithm for prognosticating clinical outcome of Chiari malformation Type I with syringomyelia: results from a predictive model analysis of 82 surgically managed adult patients

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  • Sri Sathya Sai Institute of Higher Medical Sciences, Bangalore, India
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TO THE READERSHIP: A few errors appeared in the article by Thakar et al. (Thakar S, Sivaraju L, Jacob KS, et al. A points-based algorithm for prognosticating clinical outcome of Chiari malformation Type I with syringomyelia: results from a predictive model analysis of 82 surgically managed adult patients. J Neurosurg Spine. 2018;28[1]:23–32).

In Table 2, a few of the listed percentage values were erroneous, and the value for “Obex position relative to FM, mm” was incorrect; the correct value is “7.96 ± 3.12.” The corrected table appears here.

TABLE 2.

Radiological variables of the study cohort

VariableValue
Syrinx location, n (%)
 Cervical8 (14.03)
 Cervicothoracic38 (66.66)
 Thoracic1 (1.75)
 Holocord10 (17.54)
Syrinx type, n (%)
 Central6 (10.53)
 Enlarged45 (78.94)
 Deviated6 (10.53)
Scoliosis, n (%)17 (29.82)
Syrinx levels12.23 ± 4.67
Tonsillar herniation18.53 ± 6.78
Syrinx/cord ratio0.75 ± 0.17
4th ventricle width, mm12.48 ± 4.99
C-2 retroversion, deg104.69 ± 8.52
C-2 retroflexion, deg101.28 ± 7.29
Clivus-canal angle, deg135.29 ± 10.98
Cerebellomedullary angle, deg148.48 ± 10.92
pB–C2 distance, mm4.54 ± 2.31
Obex position relative to FM, mm7.96 ± 3.12
FM dimensions, mm
 Anteroposterior, i.e., McRae line31.93 ± 4.89
 Lateral28.01 ± 3.82
PFV/ICV ratio153.00 ± 28.76
L-line–bulbopontine sulcus distance, mm12.19 ± 3.28
L-line–FVV distance, mm21.50 ± 5.49
L-line–tonsillar tip distance, mm17.37 ± 7.81
M-line–bulbopontine sulcus distance, mm2.13 ± 3.31
M-line–FVV distance, mm22.41 ± 6.01
M-line–tonsillar tip distance, mm21.16 ± 4.51
C2–7 sagittal angle, deg13.48 ± 12.48
Cervical taper ratio−0.51 ± 0.47

Values are shown as the mean ± SD unless indicated otherwise.

The article has been corrected online as of May 22, 2020.

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Contributor Notes

INCLUDE WHEN CITING Published online May 22, 2020; DOI: 10.3171/2020.5.SPINE17264a.

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