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The transoral approach is a direct route to the clivus. However, application of this approach is infrequent because of the risk of cerebrospinal fluid (CSF) fistula and subsequent meningitis. We report a case of clival metastatic tumor treated by staged operation without CSF leakage. A 39-year-old man was found to have a tumor in clivus extending to the intradural space. Two-staged resection through the lateral suboccipital and transoral approach was performed and the dural defect was replaced by a fascia in the first operation. CSF leakage was prevented by this procedure. The patient received radiotherapy postoperatively.