BACKGROUND: Trigeminal schwannomas are the most common intracranial nonvestibular
schwannomas, and the dumbbell-shaped subtype is the most challenging. OBJECTIVE: To
evaluate the efficiency and safety of the endoscope-assisted retrosigmoid intradural
suprameatal approach (EA-RISA) for dumbbell trigeminal schwannomas and to compare EA-
RISA with classic RISA. METHODS: A retrospective study of all patients with trigeminal
schwannomas was performed with a focus on dumbbell tumors. Tumors were classified …