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  • Title: Intracisternal neurinoma of the C1 posterior root.
    Author: Takumi I, Isayama K, Osamura RY, Kobayashi S, Teramoto A.
    Journal: Acta Neurochir (Wien); 2005 Nov; 147(11):1189-92; discussion 1192. PubMed ID: 16155804.
    Abstract:
    We report a rare intracisternal C1 posterior root neurinoma in a 35-year-old man without neurofibromatosis who presented with headache, nuchal pain, bilateral motor weakness of the upper extremities, and numbness in the right distal upper extremity. CT and MRI study showed a 20-mm intracisternal lesion at the foramen magnum. At surgery, there was an anastomosis between the C1 posterior root and a spinal accessory nerve at the site of the tumor; the root from the collateral sulcus of this C1 root was absent. Postoperatively, the patient remains free of symptoms. Foramen magnum neurinomas have been described as accessory nerve tumors. We present new anatomical consideration regarding this lesion.
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