Presentation
Headache and left sided tinnitus.
Patient Data
Cystic low attenuation, lobulated mass with enhanced septa, occupying the region of the left cerebellopontine angle, which extends into the left internal acoustic meatus.
Case Discussion
An acoustic schwannoma is a relatively common type of tumor which arises from the vestibulocochlear nerve (CN VIII). Acoustic neuromas containing cystic parts are fairly common, but it is rare to be mainly composed of cysts.
The causes of the unusual cystic changes of acoustic neurinomas may be similar to that of the small cysts that often accompany solid tumors, as necrosis, degeneration and hemorrhage within the tumor.
The differential diagnosis of cystic acoustic neurinomas can include epidermoid cyst, arachnoid cyst, neurenteric cyst, dermoid cyst and lipoma.
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