Supplementary Material for: Mortality in Patients with Brainstem Cavernous Malformations

<b><i>Objective:</i></b> Brainstem cavernous malformations (BSCM)-associated mortality has been reported up to 20% in patients managed conservatively, whereas postoperative mortality rates range from 0 to 1.9%. Our aim was to analyze the actual risk and causes of BSCM-associated mortality in patients managed conservatively and surgically based on our own patient cohort and a systematic literature review. <b><i>Methods:</i></b> Observational, retrospective single-center study encompassing all patients with BSCM that presented to our institution between 2006 and 2018. In addition, a systematic review was performed on all studies encompassing patients with BSCM managed conservatively and surgically. <b><i>Results:</i></b> Of 118 patients, 54 were treated conservatively (961.0 person years follow-up in total). No BSCM-associated mortality was observed in our conservatively as well as surgically managed patient cohort. Our systematic literature review and analysis revealed an overall BSCM-associated mortality rate of 2.3% (95% CI: 1.6–3.3) in 22 studies comprising 1,251 patients managed conservatively and of 1.3% (95% CI: 0.9–1.7) in 99 studies comprising 3,275 patients with BSCM treated surgically. <b><i>Conclusion:</i></b> The BSCM-associated mortality rate in patients managed conservatively is almost as low as in patients treated surgically and much lower than in frequently cited reports, most probably due to the good selection nowadays in regard to surgery.