Results.After decompression, 58% of patients developed epidural hematoma of sufficient magnitude to compress the thecal sac beyond its preoperative state at one or more levels.

• 结果：减压后，58%25的患者发生了硬膜外血肿，血肿体积大，较术前在一个或多个节段压迫硬膜范围更大。