Letter to the Editor. Microsurgical obliteration of a type IV spinal arteriovenous fistula with a hemostatic thrombin solution. - Kalantari T; Zamarrón Á; Pérez de Vargas Martínez A; Vega A; Ortega-Angulo C; Gutiérrez-González R (Journal of neurosurgery. Case lessons, 2024)