Two observers in consensus retrospectively reviewed 137 magnetic resonance imaging (MRI) scans of patients with histological diagnosis of VS (33 women, 26 men), 116 with both HRT2-WI and Gd T1-WI.
2) Comparing the interpretation of VS growth between T1C and HRT2 sequences and reviewers, defined as an increase in tumor diameter of more than or equal to 2 mm or a volume increase of more than or equal to 20%.
Imaging data (contrast-enhanced T1-weighted [ceT1] and high-resolution T2-weighted [hrT2] MR images) from all patients meeting the study's inclusion/exclusion criteria who had a single sporadic VS treated with Gamma Knife stereotactic radiosurgery were used to create a model.