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Journal of Neuro-Oncology

, Volume 130, Issue 2, pp 341–349 | Cite as

Surgical resection of fourth ventricular ependymomas: case series and technical nuances

  • Ethan A. Winkler
  • Harjus Birk
  • Michael Safaee
  • John K. Yue
  • John F. Burke
  • Jennifer A. Viner
  • Melike Pekmezci
  • Arie Perry
  • Manish K. Aghi
  • Mitchel S. Berger
  • Michael W. McDermottEmail author
Topic Review

Abstract

Ependymomas are rare neuroepithelial tumors which may arise anywhere along the ventricular system. Tumors arising in the fourth ventricle present unique challenges. Complete tumor resection favors prolonged survival, but may result in inadvertent injury of surrounding neural structures—such as cranial nerve (CN) nuclei. Here, our institutional experience with surgical resection of fourth ventricular ependymomas is described. A single institution, retrospective analysis of consecutive case series of adult surgically resected fourth ventricular ependymomas with the bilateral telovelar approach. Extent of resection, outcomes and postoperative complications are statistically analyzed. From January 2000 to April 2016, 22 fourth ventricular ependymomas underwent surgical resection. Gross total resection was achieved in 18 of 22 cases (82 %). There were six postoperative CN palsies—3 lower CN palsies (IX, X, or XI), 1 CN VII palsy, 1 CN IV palsy, and 1 CN VI palsy. No deaths or cerebellar mutism occurred. Two of 6 CN deficits resolved and the rate of permanent neurologic deficit was 18 %. A CN deficit was not statistically associated with prolonged hospital stay or functional outcome. With exception of one patient, all patients functionally improved or remained unchanged following surgery. Postoperative complications included one wound infection (4.5 %) and four pseudomeningoceles (18 %). The rate of shunt-dependent hydrocephalus was 18 %. Tumors adherence to the fourth ventricular floor is not an absolute contraindication for complete resection. Intraoperative neuro-monitoring is essential, and the development of sustained, but not transient CN activity, and/or hemodynamically significant bradycardia should limit the extent of resection.

Keywords

Ependymoma Tumors Fourth ventricle Surgical resection Telovelar approach 

Notes

Acknowledgments

We acknowledge Kenneth Probst for providing us with the illustration of the floor of the fourth ventricle.

Supplementary material

Supplementary material 1 (M4V 127645 KB)

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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  • Ethan A. Winkler
    • 1
  • Harjus Birk
    • 1
  • Michael Safaee
    • 1
  • John K. Yue
    • 1
  • John F. Burke
    • 1
  • Jennifer A. Viner
    • 1
  • Melike Pekmezci
    • 2
  • Arie Perry
    • 2
  • Manish K. Aghi
    • 1
  • Mitchel S. Berger
    • 1
  • Michael W. McDermott
    • 1
    Email author
  1. 1.Department of Neurological SurgeryUniversity of California San FranciscoSan FranciscoUSA
  2. 2.Deparmtent of Pathology, Neuropathology UnitUniversity of California San FranciscoSan FranciscoUSA

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