Internal auditory canal (IAC) arachnoid cysts are rare lesions that can mimic vestibular schwannomas. A 39-year-old female presented with a 9-year history of left-sided tinnitus and hearing loss. MRI showed an expanding cystic lesion in the IAC with ring enhancement, mimicking vestibular schwannoma....
✦ The floor
Discussion
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Radiologists and otologists should include internal auditory canal arachnoid cysts in the differential diagnosis when MRI shows an enhancing lesion mimicking vestibular schwannoma, as misidentification could lead to unnecessary intervention.
This rare case underscores a diagnostic pitfall that could lead to surgical mismanagement; awareness among audiologists and otologists can prompt appropriate specialist referral and additional imaging before treatment decisions.
- 01Rare case: an internal auditory canal arachnoid cyst showed MRI enhancement identical to vestibular schwannoma.
- 02Patient was a 39-year-old female; clinical and radiological presentation was misleading.
- 03Highlights a critical differential diagnosis pitfall in inner ear imaging.
- 04Correct identification prevents unnecessary surgery for a benign cyst.
- 05Published as a case report in Ear, Nose & Throat Journal.
Internal auditory canal arachnoid cysts can demonstrate MR enhancement mimicking vestibular schwannoma clinically and radiologically.
studysupported- PMID
- 42474047
- DOI
- 10.1177/01455613261471276.
- Journal
- Ear, Nose & Throat Journal
- Publication type
- case_report
- Evidence level
- 4
- Sample size
- 1
- Population
- Single 39-year-old female with an internal auditory canal lesion
- Intervention
- MRI imaging of internal auditory canal arachnoid cyst
Primary outcomes
Radiological characteristics of the arachnoid cyst on MRI; Differentiation from vestibular schwannoma