Asymptomatic Intracranial Schwannoma originating from the First Cervical Nerve Root: A Case Report

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  • 第1頚神経根より発生した無症候性頭蓋内schwannomaの1例

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Abstract

We report a case of intracranial schwannoma originating from the C_1 posterior root, detected incidentally by brain CT scan after traumatic examination. An 80-year-old. female fell down and suffered a head injury. She went to the nearest hospital by herself. Neurological examination showed no signs of injury. A CT scan revealed no traumatic changes, but a low-density mass from the posterior cranial fossa to upper cervical level. She was admitted to our hospital where MRI showed that the tumor extended from the C_2 level of the spinal cord to the vermis of the cerebellum. A whole body search, faild to show any abnormalities. We removed the tumor by posterior craniectomy and cervical laminectomy. In the operative views, the tumor was found to originate from the right C_1 posterior root. By cutting off the originating portion, the tumor was completely removed. The pathological diagnosis was schwannoma. The patient was discharged without any neurological deficits. To our knowledge, schwannomas of the cervical root are not necessarily rare, but a case evolving upward and found as an intracranial tumor with no symptomatic signs is uncommon.

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