Imaging Characteristics of Schwannoma of the Cervical Sympathetic Chain: A Review of 12 Cases

Gopinathan, Anil; Tan, Tiong Yong

doi:10.3174/ajnr.a2212

Cited by 92 publications

(82 citation statements)

References 18 publications

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“…[9][10][11][12] In this study, we thought that it was not adequate to select skeletal muscle as an object for the comparison of MR signal intensity because almost all schwannomas show higher T2 signal intensity than skeletal muscle. Therefore, we compared the signal intensity of the solid part of the schwannoma with that of the brain stem, and most of the sinonasal schwannomas (8 of 9, 88.9%) were isointense with the brain stem on T2-weighted MR images in our study ( Figs 1C and 3C).…”

Section: Discussionmentioning

confidence: 99%

“…In addition, although schwannomas have a true capsule composed of dense and thick fibrotic tissue surrounding the tumor parenchyma, exact 1:1 imaging-pathologic correlation could not be performed in our study because most of the schwannomas were removed in pieces and not en bloc. 12,17 We delineated the tumor capsule on pathologic examination in 2 cases after surgery (patients 1 and 3), but it was difficult to identify a fibrous capsule on MR imaging because of confusion with the low signal intensity of adjacent compressed tissue such as the bony lamellae of the ethmoid sinus. Better imaging delineation of the fibrous capsule surrounding schwannomas would be helpful in differentiating schwannomas from other sinonasal neoplasms, but the sinonasal cavity has anatomic features (air, bone) mentioned above that make identification of the capsule difficult on imaging.…”

Section: Discussionmentioning

confidence: 99%

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CT and MR Imaging Findings of Sinonasal Schwannoma: A Review of 12 Cases

Kim¹,

Kim

Kim³

et al. 2012

AJNR Am J Neuroradiol

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SUMMARY:Schwannomas are benign tumors that are rarely found in the sinonasal cavity, and the purpose of this study was to characterize the CT and MR imaging findings of 12 patients with surgically proved sinonasal schwannomas. Assessed features include location, margin, shape, size, internal architecture, pattern and degree of enhancement, and associated bony wall changes. The characteristic CT and MR imaging findings of sinonasal schwannoma include a well-defined soft-tissue mass, most frequently occurring in the nasal cavity and ethmoid sinus with pressure remodeling of the adjacent bony wall. The tumors were isoattenuating on CT and predominantly isointense on both T1-and T2-weighted MR images, compared with the brain stem. Mild contrast enhancement on CT and strong enhancement on MR images were also demonstrated in most of the tumors, and cystic or hemorrhagic changes were noted in 2 cases. S

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

CT and MR Imaging Findings of Sinonasal Schwannoma: A Review of 12 Cases

Kim¹,

Kim

Kim³

et al. 2012

AJNR Am J Neuroradiol

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“…The tumour at the floor of tongue showed abundant Antoni A areas compared with the tumour of the tongue. 20,21 When the CT scans of schwannomas show inhomogeneous areas, a malignant change in the neurogenic tumour may be suspected. 16 In this patient, contrast-enhanced computed tomography (CT) of oropharynx demonstrated a wellcircumscribed soft tissue density mass, oval shape, connected with the left portion base of tongue, homogenous, and strong enhancement mass.…”

Section: Discussionmentioning

confidence: 99%

Base of tongue schwannoma on a 22 year old lady: a rare case

Indrasari

Fedriani

2017

Int J Otorhinolaryngol Head Neck Surg

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Schwannomas are benign tumours arising from the Schwann cells. Around 25-45% schwannomas have been reported occured in head and neck region, but only 1% located intraoral. We report a case of 22 year old woman who presented with foreign body sensation in throat, dysphagia, change of voice, and snoring. There was a slowly growing, solitary, encapsulated, painless, mass on the tongue base. Microscopically, it had the typical features of schwannoma, the diagnosis being supported by a strong positivity for S-100 protein. Ki67 staining showed low proliferative index (<5%) indicated benign schwannoma. CT-scan of oropharynx demonstrated a well-circumscribed soft tissue density mass, oval shape, connected with the left portion base of tongue, homogenous, and strong enhancement mass. The entire mass was removed in general anesthesia with conservative surgical excision via trans-oral route, histopathologic reported consistent as schwannoma. The patient remained disease-free, without any residual problems. Although the rarity of schwannoma on the tongue base, this case highlights the importance of including it in the differential diagnosis of mass from the tongue base. To the best of our knowledge, our case is only the twentieth of schwannoma at the base of tongue that reported in the literature. <p> </p>

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“…Imaging characteristics on MRI favoured the diagnosis of schwannoma. 7 Local excision is the treatment of choice in tongue base schwannomas. 8 Radiotherapy is not done to schwannomas as they are not radiosensitive.…”

Section: Case Reportmentioning

confidence: 99%