Cystic acoustic schwannoma
Headache and left sided tinnitus.
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Cystic low attenuation, lobulated mass with enhanced septa, occupying the region of the left cerebellopontine angle, which extends into the left internal acoustic meatus.
An acoustic schwannoma is a relatively common type of tumour 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.