Study design | | Review of previously collected MRIs | | Review of previously collected MRIs | | Review of previously collected MRIs | | Prospective |
Eligibility criterion for VS measurements | | All VS measurements, including postoperative measurements on recurrent or residual VS | | All pre-operative VS measurements, even if both VS were resected prior to enrolment | | All pre-operative VS measurements, even if both VS were resected prior to enrolment | | At least one currently unoperated VS |
No. of patients | | 22 | | 17 | | 38 | | 56 |
Length of follow up | | 3.7 years (mean) | | 4.0 years (median) | | 3.9 years (median) | | 2.4 years (mean) in 21 patients with long term follow up |
Volumetric method | | Box model | | Box model | | Box model | | Linear dimensions (AP, ML, GP) |
Index of VS growth rate | | Volume change (in cm3) | | TDT | | TDT | | Change in linear dimension |
Relationship of VS growth rate to increasing age | | Increasing | | Decreasing | | Decreasing | | No significant association |