Capability of constructive interference in steady state sequence versus postcontrast T1-weighted imaging in cerebellopontine angle and internal auditory canal masses

Background: The tumor size is one of the main factors in treatment cerebellopontine angle (CPA) tumors, and magnetic resonance imaging (MRI) with gadolinium-based contrast agent (GBCA) provides best evaluation. However, administration gadolinium time consuming increasing cost. There a risk nephrogenic systemic fibrosis patients renal failure liver or transplantation. Objective: purpose this study was to assess capability constructive interference steady state (CISS) sequence measuring CPA internal auditory canal (IAC) masses compared postcontrast T1-weighted images (T1-WI). Materials Methods: 118 MR studies both CISS T1-WI 45 IAC were retrospectively reviewed. Results: no significant difference between transverse diameter (p = 0.051-0.06). longitudinal measurement revealed < 0.001) measured on slightly larger than image. median two sequences less 0.9 mm. Bland-Altman plots that differences diameters within limits agreement. Interobserver agreement showed excellent correlation (r 0.994-0.999, p 0.001 by Pearson's product-moment correlation). Conclusions: may be sufficient for assessing masses, which can used interchangeably image as contrast-free option, especially follow-up vulnerable settings administration.