Steroids for Facial Nerve Function Protection in Post-surgical Vestibular Schwannoma Patients

Inclusion Criteria: 1. Age between 18 and 70 years 2. Diagnosed with untreated unilateral vestibular schwannoma 3. No facial palsy before surgery (House-Brackmann grade I) 4. Intraoperative neurophysiological monitoring confirms good facial nerve function preservation, defined as: a）Post-tumor resection, evoked compound muscle action potential amplitude \>420 μV under 0.05 mA stimulation；and b）The amplitude is \>60% of baseline value measured before dural opening 5. Signed informed consent Exclusion Criteria: 1. Contraindications for craniotomy 2. Patients requiring corticosteroids during the perioperative period, or with known corticosteroid contraindications 3. Patients or first-degree relatives with a confirmed diagnosis of neurofibromatosis type 2 (NF2) 4. Karnofsky Performance Status (KPS) score \<90 before disease onset 5. Pregnant or planning to become pregnant during the study period 6. Participation in other interventional clinical trials 7. Judged unsuitable by the investigators