Extensive Axis Laminectomy and Atlantoaxial Stabilization for an Axial Intraspinal Extradural Ganglion Cyst in a Dog

Abstract

We report the case of a 10-year-old male Pomeranian with an axial intraspinal extradural ganglion cyst who underwent extensive axis laminectomy, ganglion cyst excision, and atlantoaxial stabilization. The dog was examined due to acutely deteriorated tetraparesis. Upon neurological examination, the C1 to C5 segment was localized as the presumed impaired spinal cord. Magnetic resonance imaging (MRI) revealed a circumferential donut-like cystic lesion in the central axis of the epidural space. Axial hemilaminectomy was performed on the right side; however, the cyst was torn. A histopathological examination could not be performed. A significant initial improvement in clinical signs was followed by recurrence of the cystic lesions. During the second extensive laminectomy of the axis, partial ganglion cyst excision with atlantoaxial stabilization was performed. An intraspinal ganglion cyst was diagnosed based on MRI findings, the mucin-like cyst content, gross appearance, and histopathological examination results. The postoperative functional recovery was remarkable. At 25 months postoperatively, no neurological abnormalities were observed; absence of the ganglion cyst was confirmed on MRI. Surgical decompression involving extensive laminectomy, partial ganglion cyst excision, and atlantoaxial stabilization was successful in treating the extradural ganglion cyst. The clinical improvement was prompt; the long-term functional outcomes were satisfactory.

Keywords

intraspinal ganglion cyst - extensive laminectomy - atlantoaxial stabilization - dog

Note

This case report was presented in 2020 at the Japanese Society of Veterinary Anesthesia and Surgery conference in Osaka, Japan.

Author Contributions

K.T. performed the first surgery, F.O. performed the other surgery described in this case report. F.O. designed the case report, the main conceptual ideas, and proof outline. N.Y. collected the data. S.F. and M.T. aided in interpreting the results and worked on the manuscript. F.O. wrote the manuscript with support from S.F. All authors approved the submitted manuscript.

Animal Care

Informed consent was obtained from the client prior to their animals' participation in the study, and the study was conducted in accordance with best practices for veterinary care.

Ethical Approval

Ethical approval is not applicable. This case report did not use laboratory animals, as the subject is a domesticated dog.

Publication History

Received: 02 December 2024

Accepted: 18 March 2025

Article published online:
16 April 2025

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