Size and position of tumor

The animated image, adapted from the website of the Acoustic Neuroma Association NSW (Australia), illustrates the growth of the tumor and the four stages.

Acoustic neuromas, ANs, usually originate on the Schwann-cell sheath of the vestibular nerve (hence the alternative name vestibular schwannoma), within the bony channel called the Internal Auditory Canal (IAC).

To determine which stage your tumor is in, look at your MRI with the help of the radiologist. If you only know the largest dimension of the tumor (in millimeters - mm), here is a rough guide:

No medical decision should be based solely on information provided here. See disclaimer.

Written by patients, for patients. Comments or questions?

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