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Preoperative MRI showed severe compression of spinal nerves due to retro-odontoid tumor (a: T2WI, b: T1WI). Cervical X-ray showed OALL like a bird’s beak at the C3-6 level (c), and follow-up MRI 6 months after the first surgery clearly showed that the cerebrospinal fluid around the spinal cord had recovered and the retro-odontoid tumor was shrinking (d).
