Ultra-early Gamma Knife stereotactic radiosurgery for trigeminal neuralgia (URGEnt-TN): study protocol for a single-center, two-arm, parallel group design, pragmatic, noninferiority, phase II, randomized controlled trial with intention-to-treat analysis for pre-refractory GK-SRS in classical or idiopathic TN

超早期伽玛刀立体定向放射外科治疗三叉神经痛（URGEnt-TN）：一项单中心、双臂、平行组设计、实用性、非劣效性、II期随机对照试验的研究方案，采用意向性治疗分析，用于治疗经典型或特发性三叉神经痛难治前期患者。