Treatment strategies and prognostic factors for spinal cavernous malformation: a single-center retrospective cohort study.

Objective: The authors aimed to identify factors that influence neurological function after treatment in order to facilitate clinician decision-making during treatment of spinal cavernous malformation (SCM) and about when and whether to perform surgical intervention.

Methods: The authors performed a retrospective observational cohort study of patients with SCM who were treated at their institution between January 2004 and December 2019. Multiple logistic and Cox regression analyses were performed to determine the prognostic predictors of clinical outcome. Neurological status was assessed according to Frankel grade.

Results: A total of 112 patients met the inclusion criteria, and a minimum 24 months of follow-up was achieved by 73 surgically treated and 39 conservatively treated patients. The mean ± SD lesion size was 8.7 ± 5.2 mm. In the surgically treated group, preoperative lesion size ≤ 5 mm (OR 13.62, 95% CI 1.05-175.98, p = 0.045), complete intramedullary lesion (OR 7.48, 95% CI 1.39-40.15, p = 0.019), and subarachnoid hemorrhage (OR 6.26, 95% CI 1.13-34.85, p = 0.036) were independent predictors of worse outcome. In the conservative treatment group, lesion size ≥ 10 mm (HR 9.77, 95% CI 1.18-80.86, p = 0.034), ≥ 3 segments with hemosiderin deposition (HR 13.73, 95% CI 1.94-97.16, p = 0.009), and subarachnoid hemorrhage (HR 13.44, 95% CI 2.38-75.87, p = 0.003) were significant predictors of worse outcome. The annual hemorrhage rate of the conservatively treated patients was 4.3%.

Conclusions: Subarachnoid hemorrhage, lesion size, morphology, extent of hemosiderin involvement, and motor dysfunction were independent risk factors of prognosis. In clinical practice, these parameters may help to identify patients at high risk for worse outcome. The treatment strategy for patients with SCM should be based on these risk factors and balanced with clinical symptoms.