Spinal Accessory Schwannoma Mimicking a Tumor of the Fourth Ventricle: Case Report

Ryu Kurokawa, Masanao Tabuse, Kazunari Yoshida, Takeshi Kawase, Iver A. Langmoen, Christopher B.T. Adams, David Rojas-Zalazar, Jorge Mura, Evandro De Oliveira

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


OBJECTIVE AND IMPORTANCE: Spinal accessory schwannomas unassociated with neurofibromatosis are very rare, and only 30 cases have been reported in the literature. To our knowledge, this is the first report of a spinal accessory schwannoma mimicking a tumor of the fourth ventricle. CLINICAL PRESENTATION: A 50-year-old man presented with neck pain after being involved in a motor vehicle accident. There were no neurological deficits, but a computed tomographic scan revealed a large hypodense mass with punctuate calcifications in the fourth ventricle. The tumor exhibited low intensity on the T1-weighted magnetic resonance imaging scan and high intensity on the T2-weighted scan, and it showed inhomogeneous contrast enhancement. INTERVENTION: The tumor was totally removed by a bilateral suboccipital craniectomy and C1 laminectomy. Dissection of the surgical specimen revealed that the tumor had originated from the left spinal accessory nerve. Histopathological examination confirmed the diagnosis of schwannoma. The patient experienced transient postoperative cerebellar ataxia but recovered completely. CONCLUSION: Intracisternal-type spinal accessory schwannomas sometimes mimic a tumor of the fourth ventricle. Total surgical resection can be achieved with good outcome.

Original languageEnglish
Pages (from-to)510-514
Number of pages5
Issue number2
Publication statusPublished - 2004 Feb
Externally publishedYes


  • Accessory nerve
  • Fourth ventricle
  • Schwannoma

ASJC Scopus subject areas

  • Surgery
  • Clinical Neurology


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