| Summary: | A 52-year-old man presented with a voluminous mass lesion resembling an intraspinal-extradural tumor on magnetic resonance imaging. He had complaint ofmainly left lower extremity pain and numbnessfor 3 months, which is exacerbated suddenly a couple of days before admission. On neurological examination, he was accompanied by no lateralized motor deficits. Magnetic resonance imaging demonstrated a tumor-like longitudinal lesion, extending from the L4-5 to the L5-S1 intervertebral spaces and occupying more than the left half of the vertebral canal. The lesion, which is reported to be able to an extradural spinal tumor, turned out to be unusual sequestrated disc fragment thanks to the operation
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