Retro-odontoid Pseudotumor: Two Cases of Intradural Ganglion Cysts Arising From the Odontoid Process with Syringobulbia

Miyazawa, Ryota; Miyawaki, Satoru; Yamada, Keisuke; Amemiya, Shonan; Ikemura, Masako; Hinata, Munetoshi; Uchikawa, Hiroki; Shiode, Taketo; Kin, Taichi; Takai, Keisuke; Nakatomi, Hirofumi; Saito, Nobuhito

doi:10.1016/j.wneu.2020.08.120

Cited by 4 publications

(10 citation statements)

References 20 publications

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“…The transoral route, although popular in the late 1990s for the treatment of cervical synovial cysts (retro-odontoid), introduces a risk of infection from oral flora. Now other approaches have come into favor such as the far lateral and lateral suboccipital approaches done by Adada et al 12 and Miyazawa et al, 13 respectively.…”

Section: Discussionmentioning

confidence: 99%

Management of rare atlantoaxial synovial cyst case with extension to the cerebellopontine angle: illustrative case

D’Souza,

Seshadri,

Shah

et al. 2023

Journal of Neurosurgery: Case Lessons

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BACKGROUND Synovial cysts are a common finding in degenerative spine disease, most frequently involving the facet joints of the lumbar spine. Synovial cysts are less common in the cervical spine and rarely involve the atlantoaxial junction. OBSERVATIONS In this case report, the authors detail a unique presentation of a left atlantoaxial synovial cyst with large intracranial extension into the cerebellopontine angle causing progressive cranial nerve palsies resulting in tinnitus, vertigo, diminished hearing, gait imbalance, left trigeminal hypesthesia, left facial weakness, and dysarthria. The patient underwent a retromastoid craniectomy for resection of the synovial cyst, resulting in improvement and resolution of symptoms. Follow-up occurred at 6 weeks, 3 months, and 5 months postoperatively without recurrence on imaging. LESSONS The authors describe acute and long-term management of a unique presentation of an atlantoaxial synovial cyst including retromastoid craniectomy, intervals for follow-up for recurrence, and possible treatment options in cases of recurrence. A systematic literature review was also performed to explore all reported cases of craniocervical junction synovial cysts and subsequent surgical management.

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Section: Discussionmentioning

confidence: 99%

Management of rare atlantoaxial synovial cyst case with extension to the cerebellopontine angle: illustrative case

D’Souza,

Seshadri,

Shah

et al. 2023

Journal of Neurosurgery: Case Lessons

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show abstract

“…To the best of our knowledge, only 13 cases of intradural synovial cysts or ganglion cysts in the spinal canal have been reported previously (Table 1). [8][9][10][11][12][13][14][15][16][17][18] Among these 13 cases, two were located at the lower lumber spine, whereas the other 11 occurred at the craniovertebral junction (CVJ). None of the previous literatures noted this high frequency of dural penetration at the CVJ.…”

Section: Discussionmentioning

confidence: 99%

“…Some authors noted that CT myelography may be useful for the accurate preoperative diagnosis of such a case. 8,9) In previous literatures, IDSCs have been commonly treated with direct cystectomy through C1 laminectomy. As IDSC occupies an intradural space, direct cystectomy is essential for immediate neural decompression.…”

Section: Discussionmentioning

confidence: 99%

“…Some authors noted that CT myelography may be useful for the accurate preoperative diagnosis of such a case. 8 , 9 )…”

Section: Discussionmentioning

confidence: 99%

“…Several case reports have been published on "intradural synovial cysts" (IDSCs). [8][9][10][11][12][13][14][15][16][17][18][19] A review of these reports showed that dural penetration of the extradural cyst most frequently occurs at the craniovertebral junction. Neurological symptoms had been caused by direct compression of the spinal cord, brain stem, or hypoglossal nerve.…”

Section: Introductionmentioning

confidence: 99%

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Atlantoaxial Intradural Synovial Cyst Mimicking an Extradural Lesion Adjacent to a Retro-odontoid Pseudotumor: A Case Report

MORIGUCHI¹,

FUKUNAGA²,

Ninomiya³

et al. 2022

NMC Case Report Journal

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Atlantoaxial synovial cysts can very rarely penetrate the dura mater into the thecal sac and cause direct neural compression. Several case reports have been available on "intradural synovial cysts" (IDSCs). In this study, we report on a case with an atlantoaxial IDSC mimicking an extradural lesion. A 90-year-old man was diagnosed with a cystic lesion located laterally to the atlantoaxial joint adjacent to the retro-odontoid pseudotumor (ROP) causing cervical spinal cord compression. Thus, surgical removal was planned. On preoperative examination, the cyst, which had a two-layer structure showing a T2-isointense small mass inside a T2-hyperintense lesion, was thought to be located in the extradural region. However, operative findings showed that the cyst was located inside the dura mater. Histopathological examination suggested a synovial cyst. No recurrence of the cyst was observed until the latest follow-up after 3 years, and the ROP decreased in size. Almost all IDSCs reported previously were observed in the medial site of the atlantoaxial joint. In our case, however, the cyst was observed adjacent to the posteromedial site of the right atlantoaxial joint and the ROP, mimicking an extradural lesion. We had no knowledge regarding the IDSC before the surgery and assumed an extradural lesion. Albeit rare, the existence of such a condition should be considered.

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An Updated Review on Treatment of Cervical Synovial Cyst

Peng,

Liu,

Chang

et al. 2025

World Neurosurgery

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Retro-odontoid Pseudotumor: Two Cases of Intradural Ganglion Cysts Arising From the Odontoid Process with Syringobulbia

Cited by 4 publications

References 20 publications

Management of rare atlantoaxial synovial cyst case with extension to the cerebellopontine angle: illustrative case

Management of rare atlantoaxial synovial cyst case with extension to the cerebellopontine angle: illustrative case

Atlantoaxial Intradural Synovial Cyst Mimicking an Extradural Lesion Adjacent to a Retro-odontoid Pseudotumor: A Case Report

An Updated Review on Treatment of Cervical Synovial Cyst

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