Schwannoma of the Greater Superficial Petrosal Nerve: An Unusual Site for a Common Tumor

Uppar, Alok Mohan; Rao, Shilpa; Prasad, Chandrajit; Arivazhagan, Arimappamagan; Santosh, Vani

doi:10.1055/s-0039-1685168

Cited by 2 publications

(5 citation statements)

References 20 publications

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“…Schwannomas originating from the GSPN are a rare entity, with just 33 cases published in the literature to date (Table 1) [1,2,4,[6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22].…”

Section: Discussionmentioning

confidence: 99%

“…This is why a scalloping erosion of the anterior superior surface of the petrous bone on CT scans may be seen as pathognomonic for GSPN schwannomas, whereas trigeminal schwannomas lead to petrous apex erosion, as shown in our cases (e.g., Figs. 7 and 9) [1,18,24,25]. Therefore, a CT scan is mandatory to display the presence and extent of bone destruction.…”

Section: Discussionmentioning

confidence: 99%

“…A subtemporal approach is the recommended technique for targeting the lesion, technical details have been described in detail previously [26][27][28][29][30][31][32]. To decide between intradural, extradural, or combined techniques, symptoms and tumor size are major decision criteria [1,2,9,16]. We mainly opted for a combined technique for more detailed inspection and CSF release to reduce temporal brain retraction.…”

Section: Surgical Approach and Alternative Treatment Optionsmentioning

confidence: 99%

“…Facial nerve schwannomas account for about 0.8% of all petrous mass lesions [1]. GSPN schwannomas are an rare subgroup, with just a few case reports up to date documenting different clinical and imaging characteristics of such lesions [2].…”

Section: Introductionmentioning

confidence: 99%

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Schwannomas of the greater superficial petrosal nerve – case series, discussion of surgical techniques, and review of literature

et al. 2022

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Background Facial nerve schwannomas account for about 0.8% of all petrous mass lesions. Schwannomas of the greater superficial petrosal nerve (GSPN) are a rare subtype with few case-reports up to date. Case presentations A retrospective analysis of clinical outcomes, radiographic findings and postoperative complication between June 2007 and December 2020 was performed. Four cases of GSPN schwannomas were reported. The presenting symptoms were facial nerve palsy and hearing loss. Imaging studies showed a subtemporal mass on the anterosuperior aspect of the petrous bone, in one case with extraordinary petrous bone and mastoid infiltration and destruction. Three cases were removed through a subtemporal extra- or intradural approach, one case via a combined pre- and retrosigmoid approach. Improvement of facial nerve palsy occurred in one case; new hearing loss was observed in another case. Xeropthalmia was a short-term temporary deficit in three cases. Short- to mid-term follow-up of the patients has not shown any tumor recurrence. Conclusions GSPN schwannomas are rare entities presenting with heterogenous symptoms. Our surgical findings emphasize safe resection. Complete remission is possible by GTR. Since the small data set limits the expressiveness of statements regarding standard of care and alternative therapy options, additional data is needed.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Surgical Approach and Alternative Treatment Optionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Schwannomas of the greater superficial petrosal nerve – case series, discussion of surgical techniques, and review of literature

et al. 2022

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“…Given the location of the tumor, GSPN schwannoma is a possibility to consider. Uppar et al [ 18 ] reviewed 27 cases of GSPN schwannoma. These cases presented most commonly with a history of facial palsy (16 cases) or hearing loss (14 cases); other less commonly occurring symptoms included seizures, headache, ocular pain, and irritation.…”

Section: Discussionmentioning

confidence: 99%

Curious Case of Acoustic Schwannoma of Middle Cranial Fossa: A Case Report

Singh

Dua

Dhar

et al. 2022

Brain Tumor Res Treat

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Acoustic neuromas are the most common lesion in the cerebellopontine angle. The authors report a unique case of acoustic schwannoma, presenting in middle cranial fossa masquerading as meningioma in a 24-year-old man, presenting with headache and focal seizures. Contrast-enhanced MRI of the brain revealed a mass lesion of the right middle cranial fossa consistent with features of meningioma. Intraoperatively a well-defined tumor with attachment to anterior petrous bone was excised. In the immediate postoperative period, the patient developed right-sided hearing loss, which was proven to be retrochoclear hearing loss on brainstem evoked response audiometry. Histopathology findings were consistent with benign schwannoma. Acoustic schwannoma originating in an unusual location middle cranial fossa is a plausible explanation of such unusual occurrence. Such a case has never been reported in the literature.

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Schwannoma of the Greater Superficial Petrosal Nerve: An Unusual Site for a Common Tumor

Cited by 2 publications

References 20 publications

Schwannomas of the greater superficial petrosal nerve – case series, discussion of surgical techniques, and review of literature

Schwannomas of the greater superficial petrosal nerve – case series, discussion of surgical techniques, and review of literature

Curious Case of Acoustic Schwannoma of Middle Cranial Fossa: A Case Report

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